LOS ANGELES (AFP) - Protesters demanded answers on Tuesday (Sept 2) as they gathered in a south Los Angeles neighbourhood where sheriff's deputies shot and killed a black man during a violent confrontation the previous day.

The man, identified as 29-year-old Dijon Kizzee, was riding his bicycle when deputies tried to stop him for a code violation, according to the sheriff's department.

Kizzee ran away and when deputies caught up to him, he punched one of them in the face while dropping a bundle of clothing he was carrying, authorities said.

"The deputies noticed that inside the clothing items that he dropped was a black semiautomatic handgun, at which time a deputy-involved shooting occurred," Lieutenant Brandon Dean, of the LA County Sheriff's Department, told reporters.

Dean said it was unclear which vehicle code Kizzee allegedly violated.

Soon after the deadly confrontation, more than 100 people gathered at the scene demanding answers.

A small crowd gathered again Tuesday evening at the site of the shooting and peacefully marched, along with a caravan of cars, to the sheriff's station nearby as a police helicopter hovered overhead.

Some of the protesters carried a banner that read "Stop Killer Cops."

The shooting came as protests against police violence and racism have roiled the country in recent months following the killing of George Floyd at the hands of police in Minneapolis.

Civil right attorney Ben Crump, who is representing Kizzee's family, said he was shot more than 20 times and urged witnesses on Twitter to contact him with any information.

"They say he ran, dropped clothes and handgun," Crump, who is also representing Floyd's family, said in a tweet.

"He didn't pick it up, but cops shot him in the back 20+ times then left him for hours."

Deja, a woman who witnessed the shooting told AFP that she yelled "don't shoot him, don't shoot him" as the deputies tried to stop Kizzee.

'WE ARE TIRED'

"They were trying to grab and take his stuff away from him and then finally when it failed, he turned around to run and they tased him in the back of his leg," said Deja, who would only give her first name.

"He turned around and then they shot him."

Deja said she didn't see Kizzee holding a gun and added that deputies handcuffed him after the shooting. He was pronounced dead at the scene.

Kizzee's aunt Fletcher Fair told reporters she believes her nephew's race was a factor in the shooting.

"They (police) don't kill any other race but us and this don't make any sense," she told a press conference.

"Why us? You have Asians... Hispanics even don't get killed as much as we do. It's just us and we're tired," she said.

Sheriff Alex Villanueva offered his sympathy to the family, saying a member of his own department is one of Kizzee's cousins.

Last week, police in Kenosha, Wisconsin also shot a black man - Jacob Blake - in front of his three young sons and left him paralysed following an altercation.

The shooting prompted demonstrations in several cities and led to violent clashes in Kenosha that left two people dead.

President Donald Trump visited the city on Tuesday despite pleas to stay away and claims he is dangerously fanning tensions as a re-election ploy.