ANTIOCH, Calif. >> Six people, including five teens, were injured when gunfire erupted at a girl’s 16th birthday party in the San Francisco Bay area, authorities said Sunday.

Police in Antioch believe three or four male partygoers opened fire Saturday night when two groups began arguing, said police Lt. Scott Willerford. Violence is not common in the neighborhood in Antioch, which is about 38 miles northeast of San Francisco.

"Weapons were brandished and numerous shots were fired from multiple guns," Willerford said.

The gunfire wounded a 13-year-old boy, two 16-year-old boys, two 18-year-old men and a 21-year-old woman, police said. Their injuries ranged from a minor grazing wound to an abdomen wound, police said. Police did not say how many shots were fired, or specify what kind of weapons were used.

Three of the wounded have been released from hospitals, but the 13-year-old, an 18-year-old and the woman remained in serious but stable condition, police said. Their names have not been released.

Police are looking for three or four suspects described as "young men," but acknowledge they haven’t been able to obtain more detailed descriptions. Willerford said callers reporting the shooting had said between 70 and 80 people were at the party, but many of them ran away when the gunfire broke out.

Authorities said the party was being thrown by the girl’s parents.