SAN LEANDRO — A brawl at an Alameda County youth detention camp Monday night left four teens and one staffer injured, officials said Tuesday.

Ten teens were involved in the fight, which broke out in a Camp Sweeney recreation room at about 8 p.m., according to Chief Probation Officer Donald Blevins, whose department oversees the facility.

Blevins said the teens used pool balls and pool cues in the fight. One teen hit with a pool ball was sent to San Leandro Hospital with a broken or cracked rib, Blevins said.

Another teen received a gash over his eye, two others suffered cuts and bruises, and an onsite staffer sprained an ankle responding to the incident, Blevins said.

Blevins said the specific cause of the incident was not known, but that it was likely gang-related or racially motivated. He said the initial fight involved an African-American teen and a Hispanic teen, and that the two racial groups were segregated overnight for precautionary reasons.

"This is not a normal occurrence at Camp Sweeney," Blevins said, noting that he'd never observed teens taking sides along racial lines after previous fights.

Gideon Rubin can be reached at 510-293-2467 or grubin@bayareanewsgroup.com.