Hundreds of people have gathered for a second night of protests at the spot where a black man was pinned to the ground and shot dead by police.
Mourners, friends and relatives of Alton Sterling met at the shop in Baton Rouge where he was killed on Tuesday.
Meanwhile video has emerged of another black man being shot dead by police, this time in Minnesota.
Philando Castile was shot in his car as he reached for his driving licence, his girlfriend said.
He had earlier told the officer who pulled him over that he was licensed to carry a concealed gun and had one in his possession, she said.
The footage taken by her shows Mr Castile covered in blood next to her and the officer outside the car pointing his gun at him.
"You shot four bullets into him, sir. He was just getting his license and registration, sir," the woman says, local media reported.
Police said an investigation was under way.
In Baton Rouge, some demonstrators chanted "Black lives matter" and called for justice.
A second video emerged on Wednesday that showed the altercation between the 37-year-old and two police officers.
It appears to show Mr Sterling being held down and then shot several times, although some shots are heard when the camera moves away from the confrontation.
Seconds later, one of the officers is seen removing an object from the man's trousers as he lies on the ground with blood on his chest.
Police have said Mr Sterling was found to be armed. Officers were initially called because of a 911 report of a man brandishing a gun.
The latest video was provided to the Daily Beast by the shop owner, Abdullah Muflahi, who said it proves the man was no threat to the officers when he was shot.