Rapper P. Diddy was in police custody after he allegedly assaulted his son's football coach using a weight-room kettle bell.
The incident in which no one was injured is said to have taken place at the athletic facilities of US university UCLA, where the rapper's son is on the football team, police said.
Gossip website TMZ reported a fight with strength and conditioning coach Sal Alosi erupted after the young player was told not to come back until the end of the summer.