By Mark Memmott
The word "shocking" doesn't even capture the horrific nature of the reports from Richmond, Calif., about the gang rape and beating of a 15-year-old girl over the weekend.
Police initially said about six young men were involved in the attack. But investigators said Tuesday that they now believe that as many as 10 assailants, ranging in age from 15 to their early 20s, committed a "slew of crimes" against the girl -- including raping her and stealing her jewelry.
The men laughed and took photos as they took turns assaulting the girl, police said.
It all happened outside a high school homecoming dance.
There's a $20,000 reward for information leading to a conviction.
Update at 10:30 a.m. ET: The Associated Press says a fifth arrest has been made. We've updated the headline above.