Sun Feb 26, 9:45 PM ET

SAN JUAN, Puerto Rico - More than 1,000 demonstrators chanting anti- FBI slogans and carrying Puerto Rican flags marched through the capital of this U.S. island territory on Sunday.

Demonstrators chanted "Respect Puerto Rico !" and "FBI get out !"

Many of the marchers favor independence for the island and accuse the FBI of persecuting the movement.

They also accuse the FBI of letting Filiberto Ojeda Rios - the fugitive leader of a pro-independence militant group - bleed to death during an FBI raid in September.

Federal agents have said they shot Ojeda Rios after he fired on them, but his widow said the FBI fired first. Ojeda Rios was wanted for the 1983 robbery of a Wells Fargo armored truck depot.

Marchers Sunday later accused an onlooker of being a federal agent.

Confronting the man, demonstrators began shouting "murderer, murderer." After several minutes the man fled in an automobile and protesters banged on the car windows, cracking the glass, witnesses said.

Many of the marchers said the man had been taking photographs of the demonstration. Several witnesses said the man had been carrying a firearm.

According to police, there were no injuries in Sunday’s demonstration.

Demonstrators also chanted against the FBI’s tactics.

FBI agents on Feb. 10 searched five homes and a business to thwart what the agency said was a "domestic terrorist attack" planned by independence militants.

Luis Fraticelli, special agent in charge of the FBI on the island, has said the alleged attack would have involved explosives directed at "privately owned interests" and the public in Puerto Rico

As word spread of that FBI operation, reporters gathered outside an apartment building in the San Juan area as agents searched.

A television stations broadcast images of federal agents using pepper spray on reporters and protesters - prompting complaints from journalist associations on the island.

Fraticelli has said agents used "non-lethal force" when protesters and the media tried to cross a law enforcement perimeter.

"The move was necessary "to protect members of the media, the public and the law enforcement officers executing this lawful search warrant," he said.