The FBI has taken over a fatal shooting investigation in Orlando Wednesday.
According to sister station WFTV in Orlando, gunshots rang out just before midnight at an apartment complex.
Authorities said a suspect, whose name was not released, was shot and killed.
A man claiming to be the suspect's friend told WFTV reporter Steve Barrett that the man was being questioned by investigators about the Boston bombings. However, authorities have not confirmed that information.
"He had a ticket from New York, [and] from there, he was going to go back home. They were pushing him, saying, 'Stay, don't leave.' They said, 'We want to interview you one last time and talk to you a last time.' And he decided to stay, and today's interview was supposed to be the last time, and they said they were going to leave him alone," said the victim's friend, Khusen Taramov.
"Do you think he would have prompted some kind of a shooting incident?" Barrett asked.
"No, there is no way. I know that for sure. All he wanted was to talk to them so they could leave him alone," said Taramov.
Taramov told WFTV the man's name is Ibragim Todashev, but the FBI has not confirm that.
Authorities said Tamerlan Tsarnaev, 26, and Dzhokhar Tsarnaev, 19, were behind the deadly Boston marathon terror attacks. Tamerlan, whom authorities have described as the driving force behind the plot, was killed in a shootout with police. Dzhokhar was hospitalized from injuries sustained during a getaway attempt.
"Back in Boston, they used to hang out. Not hang out, he just knew him. He met them a few times because he was an MMA fighter, [and] the other guy was boxer. They just knew each other that's it," he said.
Investigators are saying little about what happened.
Overnight, a swarm of FBI agents moved into an apartment complex to investigate a shooting.
In a brief statement, an FBI spokesperson confirmed that the shooting involved one of their agents.
The FBI said their agent was conducting official duties when he opened fire on the man.
"FBI started following him, asking questions, 'Why you guys, what kind of connection do you have with them?' Trying to make the connection between them, you know what I mean. But there's no connection. There's no connection. I know that for sure," said Taramov.
No other details about the incident were released by the bureau, but it said more information will be released later Wednesday.
Orlando police are also assisting in the investigation.
Follow Steve Barrett on Twitter at @SBarrettWFTV for live updates from the scene.

Maurice Sendak, the author that brought us the imaginative book ‘Where The Wild Things Are’, is being exhibited with numerous pieces of his work at the Walt Disney Family Museum in San Francisco’s Presidio.
The exhibition is titled ‘Maurice Sendak: 50 Years, 50 Works, 50 Reasons’, featuring 50 works by the legendary author and illustrator. It’s accompanied by 50 statements from celebrities, authors, and noted personalities on the influence of Sendak’s work, all in celebration the 50th anniversary of his universally revered book, Where the Wild Things Are.
The museum has set up a variety of mediums he used that include sketches, illustrations, and works on paper, all of which showcase highlights from Sendak’s career and the diverse art forms in which he was renowned. Many of the works are from private collections and friends of the artist, offering a survey of his range as an artist and author. It is widely known that Sendak decided to become an illustrator at the young age of 12 after watching Disney’s film Fantasia (1940) and amassed a collection of Mickey Mouse and other Disney memorabilia throughout his lifetime.
“In the 50’s we had See Spot Run and Dick & Jane, and in the 60’s, Maurice Sendak and Ted Geisel (Dr. Seuss) really started creating a different kind of children’s literature,” said Walt Disney Family Museum CEO Gabriella Calicchio. “Literature that would inspire young people to use their imaginations and their creativity, literature that inspired critical thinking.”
The exhibition will be on view until July 7th, 2013. For more information, go to WaltDisney.org.
Some 13,000 union workers at University of California Medical Centers around the state began a two-day strike Tuesday, including laborers who walked a picket line outside UC San Francisco Medical Center late into the night.
Thousands of hospital pharmacists, nursing assistants, operating room scrubs and other health care workers observed the 48-hour walkout in its first day Tuesday as green-shirted picketers marched outside medical centers.
It prompted the postponement of dozens of surgeries but brought reassurances that patients at facilities in San Diego, Orange, Los Angeles, Santa Monica, San Francisco and Sacramento were safe.
Nurses were not on strike, emergency rooms were open, and about 450 union employees remained in critical jobs under court order.
No major problems were reported.
UC medical workers told KTVU they have been without a contract since last September. They say their concerns have fallen on deaf ears.
"They've increased the patient load, but not increase the workers," said UCSF respiratory therapist Judy McKeever.
On strike are respiratory therapists, nursing aides, various medical technicians and custodians.
The workers are represented by American Federation of State, County and Municipal Employees Union.
They complained that the UCSF Medical Center is understaffed.
"You want to be able to say is there anything else I can do for you when you're done and not have to run out the door because you have to see your next patient," said McKeever.
Labor talks broke down in December.
On Tuesday night, the university had private security guards by the hospital entrance, but there were no reports of any incidents.
However, the security was a presence welcomed by one woman visiting her daughter in the intensive care unit.
"I thought 'Gee how am I going to get through all that?'" said Vicki Colls. "But they've made it easy to get access to the hospital." Colls added that security stood there and did not escort her inside.
Another visitor, Martha Porter, said the care by replacement workers is excellent and no different than before the strike.
But another visitor said the strike has been disruptive and expects it to be disruptive again tomorrow.
UC spokeswoman Dianne Klein said dozens of surgeries and some chemotherapy treatments have been postponed.
She said the key sticking point is pension reform.
"We hope that the union will realize that this exercise has been fruitless," said Klein.
The union planned to end its picket line at 11 p.m. Wednesday night and return to the job at 6 a.m. Thurssday.

Patients usually are able to put their trust in medical professionals, but in the Bay Area some bad doctors are showing up with perfect records because the medical board that oversees them isn't doing its job.
Robyn Frankel had an active and accomplished life as a horsewomen and trainer in Woodside. She was raising two beautiful children and living an extremely active life with family and friends. That was until she went into the hospital to have an operation for her migraines.
Unfortunately, mistakes by her doctors caused irreversible brain damage. Frankel won a multi-million dollar malpractice jury verdict against her physicians fourteen months ago.
The California Medical Board is supposed to publicize and sanction bad doctors, but KTVU checked records and found that both of Frankel's doctors still have perfect records.
Carmen and Bob Pack of Danville told KTVU the medical board took four years to sanction doctors who overprescribed pain pills.
A driver got extra pills from them and killed the Packs' two young children in a car accident while driving high on vicodin.
In Sacramento three weeks ago, the Packs led a rally calling for a new ballot initiative unless lawmakers reform the medical board and change rules advocates say penalize wronged patients.
State Senator Curren Price of Los Angeles is authoring SB-304.
"We can't allow individuals charged with healing to be instruments of death," said Price.
The proposed bill comes after years of complaints and allegations that the California Medical Board has not been doing its job. KTVU first reported on difficiencies with the board eight years ago.
San Francisco medical malpractice attorney Jeffery Mitchell told KTVU he has been battling the board for sixteen years.
"The same kind of conduct, same procedure, same expectations. It hasn't changed," said Mitchell.
While the medical board employs gun-toting investigators and has made promises to get tough with bad doctors, but KTVU has uncovered federal reviews showing just how lax the California Medical Board's policing has become.
Part of the State Department of Consumer Affairs, a majority of the medical board are doctors. Right now, the Board is under "sunset review" and could be abolished.
"We're nowhere near our goals," admitted California Medical Board spokesperson Cassandra Hockenson. "We're not perfect. It still needs work, but it is working and it is improving."
Lawmakers also set a $250,000 cap on certain damages doctors must pay 38 years ago with a tort-reform called the MICRA or Medical Injury Compensation Reform Act. The physicians lobby then promised a tougher medical board.
Napa doctor Andrew Fenton told KTVU clinics including Planned Parenthood need that cap to control costs.
"MICRA's been extremely important in keeping these clinics open, increasing access to those who are most vulnerable," said Fenton. "That's going to be especially critical now at a time when we're expanding healthcare coverage to millions of Californians".
But critics say cost of living should boost the 1975 MICRA cap to more than a million dollars today. Under the law, right now no life or injury is worth more than $250,000.
Mitchell says many attorneys won't take malpractice cases because of the cap.
"The cap is a terrible, dismal pathetic failure. It's basically given physicians a free pass," said Mitchell.
The jury that ruled on paraplegic Robyn Frankel's case awarded her $6 million for pain and suffering last year.
"We thought we were going to get that $6 million to help her with her 24 hour care and taking care of her," said Robyn's sister Kimber Frankel. "Then we found out there's a cap law."
Frankel got the maximum $250,000. Robyn told KTVU the law needs changing so that "other people don't have the same problem as I have."
It won't put Robyn Frankel back on her favorite horse, but she says new rules may rein in unfairness for others.

Rescue workers neared the end of the search for survivors and the dead in the Oklahoma City suburb where a mammoth tornado destroyed countless homes, cleared lots down to bare red earth and claimed 24 lives, including those of nine children.
Scientists concluded the storm was a rare and extraordinarily powerful type of twister known as an EF5, ranking it at the top of the enhanced Fujita scale used to measure tornado strength. Those twisters are capable of lifting reinforced buildings off the ground, hurling cars like missiles and stripping trees completely free of bark.
After nearly 24 hours of searching, Moore's fire chief said he was confident there were no more bodies or survivors in the rubble.
"I'm 98 percent sure we're good," Gary Bird said Tuesday at a news conference with the governor, who had just completed an aerial tour of the disaster zone.
Authorities were so focused on the search effort that they had yet to establish the full scope of damage along the storm's long, ruinous path.
They did not know how many homes were gone or how many families had been displaced. Emergency crews had trouble navigating devastated neighborhoods because there were no street signs left. Some rescuers used smartphones or GPS devices to guide them through areas with no recognizable landmarks.
The death toll was revised downward from 51 after the state medical examiner said some victims may have been counted twice in the confusion. More than 200 people were treated at area hospitals.
By Tuesday afternoon, every damaged home in Moore had been searched at least once, Bird said. His goal was to conduct three searches of each building just to be certain there were no more bodies or survivors.
The fire chief was hopeful that could be completed before nightfall but efforts were being hampered by heavy rain.
Crews also continued a brick-by-brick search of the rubble of a school that was blown apart with many children inside.
No additional survivors or bodies have been found since Monday night, Bird said.
Survivors emerged with harrowing accounts of the storm's wrath, which many endured as they shielded loved ones.
Chelsie McCumber grabbed her 2-year-old son, Ethan, wrapped him in jackets and covered him with a mattress before they squeezed into a coat closet of their house. McCumber sang to her child when he complained it was getting hot inside the small space.
"I told him we're going to play tent in the closet," McCumber said, beginning to cry.
"I just felt air so I knew the roof was gone," she said Tuesday, standing under the sky where her roof should have been. The home was littered with wet gray insulation and all of their belongings.
"Time just kind of stood still" in the closet, she recalled. "I was kind of holding my breath thinking this isn't the worst of it. I didn't think that was it. I kept waiting for it to get worse."
"When I got out, it was worse than I thought," she said.
Oklahoma Gov. Mary Fallin lamented the loss of life, especially of the nine children killed, but she celebrated the town's resilience.
"We will rebuild, and we will regain our strength," Fallin said.
From the air, large stretches of the town could be seen where every home had been cut to pieces. Some homes were sucked off their concrete slabs. A pond was filled with piles of wood and an overturned trailer.
Also visible were large patches of red earth where the tornado scoured the land down to the soil. Some tree trunks were still standing, but the winds ripped away their leaves, limbs and bark.
In revising its estimate of the storm's power, the National Weather Service said the tornado, which was on the ground for 40 minutes, was a top-of-the-scale EF5 twister with winds of at least 200 mph (320 kph).
The agency upgraded the tornado from an EF4 based on reports from a damage-assessment team, said spokeswoman Keli Pirtle. Monday's twister was at least a half-mile (nearly a kilometer) wide, and it was the first EF5 tornado of 2013.
Other search-and-rescue teams focused their efforts at Plaza Towers Elementary School, where the storm ripped off the roof, knocked down walls and destroyed the playground as students and teachers huddled in hallways and bathrooms.
Seven of the nine dead children were killed at the school, but several students were pulled alive from under a collapsed wall and other heaps of mangled debris. Rescue workers passed the survivors down a human chain of parents and neighborhood volunteers. Parents carried children in their arms to a triage center in the parking lot. Some students looked dazed, others terrified.
Plaza Towers and another school in Oklahoma City that was not as severely damaged did not have reinforced storm shelters, or safe rooms, said Albert Ashwood, director of the Oklahoma Department of Emergency Management.
More than 100 schools across the state do have safe rooms, he said. He added that a shelter would not necessarily have saved more lives at Plaza Towers.
Officials were still trying to account for a handful of children not found at the school who may have gone home early with their parents, Bird said Tuesday.
President Barack Obama pledged to provide federal help and mourned the death of young children who were killed while "trying to take shelter in the safest place they knew — their school."
Moore has been one of the fastest-growing suburbs of Oklahoma City, attracting middle-income families and young couples looking for stable schools and affordable housing. Many residents commute to jobs in Oklahoma City or to nearby Tinker Air Force Base.
