6 dead, at least 10 injured in shooting in downtown Sacramento, California.

California police are looking for at least one suspect in connection with a mass shooting early Sunday in downtown Sacramento that claimed the lives of six people and injured 10 others.

Sacramento Police Chief Kathy Lester told a news conference that police were patrolling the area around 2 a.m. when they heard gunshots. When they arrived at the scene, they found a large crowd gathered in the street and six people dead. 10 others abducted themselves or were taken to hospital. No information was given on their conditions.

Authorities do not know if one or more suspects were involved and are asking for the public’s help in identifying who is responsible. Lester did not elaborate on the type of weapon used.

It’s “a very complex and complicated scene,” she said. Lester appealed to the public, asking for witnesses or anyone with tapes of the incident to contact police.

Shortly after the shooting, a video was posted on Twitter showing people running down the street to the sound of rapid gunfire. The video showed several ambulances at the scene.

Residents have been urged to avoid the area, which is full of restaurants and bars that leads to the Golden 1 Center, where the Sacramento Kings play basketball.

A roadblock is placed a block from the scene of an apparent mass shooting in Sacramento early Sunday. (Rich Pedroncelli/Associated Press)

Berry Accius, a community activist, said he came to the scene shortly after the shooting.

“The first thing I saw was victims…a young girl screaming, saying, ‘They killed my sister.’ A mother came running up, ‘Where is my son, has my son been shot?'” he said.

Kay Harris, 32, said she was asleep when a family member called to say they thought her brother had been killed. She said she thought he was in London, a nightclub on 10th Street.

Harris said she had been to the club a few times and described it as a place for “the younger crowd”.

Police closed off the streets around the club, with yellow police tape billowing in the early morning breeze. Harris says she spent the morning walking around the block waiting for news.

“It really is a senseless act of violence,” she said.