• The house party was thrown to celebrate the birthday of one of the victims
  • The fifth victim confessed to being part of a street gang in another city
  • Multiple firearms and suspects were involved in the incident, authorities said

At least four people have been killed and one injured in a "targeted ambush" shooting at a house party in California.

Police responded to a shooting report at a short-term rental home in Inglewood around 1:30 am on Sunday. Two men and two women, identified as Breahna Stines, 20, and her sister Marneysha Hamilton, 25, were shot and killed.

The Mayor of Inglewood James Butts said the victims appeared to be targeted, calling the incident the worst single shooting crime in decades.

Another man, the fifth victim, was taken to a hospital in critical condition. He is expected to survive, Associated Press reported. The man allegedly told officers that he is part of a street gang in another city. Investigators are looking into possible gang-related motives, but have not yet confirmed the cause of the shooting.

According to Butts, multiple firearms including one assault rifle and a handgun were used in the shooting.

"This is the largest number of shooting victims that have been injured in this city since the 1990s," Butts told reporters, Los Angeles Times reported. "These are sociopathic killers that have to be sequestered from society."

Butts asked the suspects to turn themselves in. "We will find you and prosecute you," he said, the Associated Press reported.

Authorities did not release the name of the other victims. However, a mourner at the crime scene claiming to be a family member of one of the victims said the party was allegedly thrown to celebrate Stines’s birthday.

"Everyone got along with them. All she wanted to do was celebrate her birthday and her sister came to be with her," a relative was quoted, as saying by the Times.

Michelle Fahmy, who lives near the crime scene told CBSLA that she heard at least 30 consecutive pops. She added that violent crimes in the area were not usual.

Friends and family members of the victims gathered near the crime scene Sunday evening to remember them. "Can you imagine losing two kids at one time?" Breahna’s mother, Tiffeny Steins said to CBSLA. "I'm gonna make sure her story gets heard."

Authorities are investigating the case and are searching for multiple suspects. Officers are canvassing the area near the scene for surveillance cameras and have interviewed some witnesses.

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Representational Image AFP / Johannes EISELE