Fresno, Jan 1 (AP) Police in California announced that they have arrested six suspected gang members in the shooting deaths of four men last November at a backyard gathering of family and friends that they believed was a rival gang's party.

The victims were killed on November 17 when gunmen entered the back of a Fresno home through an unlocked gate and used semiautomatic weapons to open fire on people watching a football game in the backyard. Four people were killed, and six people were wounded.

Fresno Police Chief Andy Hall said at a news conference on Tuesday that the suspects are all self-admitted members of the Mongolian Boys Society gang and that they were retaliating against a rival gang called the Asian Crips that they believed was responsible for killing a member of their gang hours earlier.

One of the people at the house was an affiliate of the Asian Crips but was not active in the gang, Hall said, though the Mongolian Boys Society believed it was a gang party.

Five people left the party before police arrived and authorities are still working on identifying them and whether they had gang ties, Hall said.

Billy Xiong, 25, of Fresno, was arrested on suspicion of mail theft on December 17, and authorities found one of the weapons used in the killing of the four men, Hall said. His brother, Randy Xiong, was the gang member who was slain 16 hours before the mass shooting.

"We know now that this was a retaliatory shooting towards the gang believed responsible for Randy Xiong's death," Hall said.

Fresno police served 19 search warrants on December 26, recovering the other gun used in the slayings, which had been stolen from Oklahoma, Hall said. Besides the two guns used in the attack, authorities also recovered 12 other weapons and USD46,000 in cash believed to be tied to drug activity.

Also arrested were Anthony Montes, 27; Jhovanny Delgado, 19; Pao Vang, 19; Porge Kue, 26; and Johnny Xiong, 25. Sia Vang is wanted, police said.

The chief didn't say who the shooters were but that all six planned the attack.

The six who were arrested are all being held on bail of USD11 million each, and it's unclear if they had lawyers yet who could speak on their behalf.

All the victims were of Hmong descent and the shooting rattled the central California city, home to the second-largest Hmong community in the US.

Killed were Xy Lee, 23, a popular singer in the community, and Kalaxang Thao, 40, who is survived by two daughters and a pregnant wife, according to a GoFundMe site. Another victim was Phia Vang, 31, who supported his parents and younger siblings with earnings from his job delivering clinical lab results.

The shooting occurred at the home of the fourth victim, Kou Xiong, 38, a gregarious sushi chef who loved hosting parties. Xiong is survived by his wife and young daughter.

Both Vang and Xiong were children when they moved to the United States from Thailand as part of refugee relocation efforts.

Hmong, an ethnic minority group from East and Southeast Asia, fought on the side of the United States in the Vietnam War. After the war, the US moved them to places in Minnesota, California and Wisconsin.

In California, Hmong settled in Fresno and the Central Valley, where sponsors hoped they could find work given their agricultural background. (AP)

(This is an unedited and auto-generated story from Syndicated News feed, LatestLY Staff may not have modified or edited the content body)