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A Florida man was shot and killed when he became violent while being questioned by Boston bombing investigators, FBI officials say.

The shooting took place early on Wednesday as officials interviewed 27-year-old Ibragim Todashev.

The FBI initially said their agent had killed Todashev, but an updated statement left unclear the question of who had fired the deadly shot.

Two Massachusetts State Police officers were also in the room, the FBI said.

The FBI agent was taken to hospital with non-life threatening injuries, and an agency team has been dispatched to review the shooting, standard procedure in such cases.

Police have blocked off the apartment complex in the Orlando suburb of Kissimmee where the Chechen immigrant was shot.
'Martial arts fighter'

In a statement, the FBI said the agent, as well as "two Massachusetts State Police troopers and other law enforcement personnel", were interviewing Todashev when "a violent confrontation was initiated by the individual".
Police mugshot of Ibragim Todashev after his arrest on suspicion of assault on 4 May 2013 Ibragim Todashev was arrested this month after a row over a parking spot

"During the confrontation, the individual was killed and the agent sustained non-life threatening injuries."

In an earlier statement, an FBI spokesman had said "the [FBI] Special Agent, acting on the imminent threat posed by the individual, responded with deadly force".

US media reported that Todashev had known Tamerlan Tsarnaev, the ethnic Chechen Boston bombings suspect killed in a shootout with police days after last month's deadly marathon blasts.

Public records also show Todashev - who was reportedly a mixed-martial arts fighter - lived in Watertown, Massachusetts, just outside Boston, last year.

A friend of the dead man, Khusen Taramov, told Florida News 13 that the FBI had begun questioning and following Todashev soon after the Boston bombings.

Mr Taramov was quoted as saying: "One day they started questioning us, next day after the bombing, not the bombing, after they found out the bombers were Chechnyans, and they started following us, watching us."

He told the news station that the FBI had pressured Todashev into cancelling a plane ticket to Chechnya that he bought before the Boston bombings.

The Associated Press news agency meanwhile reports that Todashev was arrested earlier this month on suspicion of assault, after a dispute over a parking spot at an Orlando shopping centre.

Todashev put a man in hospital with facial injuries during the fracas, according to a report from the Orange County Sheriff's Office.

The Boston Marathon blasts killed three people and injured 264 others on 15 April.

Tsarnaev's brother, Dzhokhar Tsarnaev, 19, is being held in a prison hospital after being shot before capture. He faces the death penalty if convicted.

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