you MUST report it to the cops. there have been other incidents in the recent past and the cops were pretty on it. it's most likely punks from the projects right there, and they need to be kept in line. culver city has spent too much money on their makeover and can't afford this stuff to happen.
Report it to the police now, and fire off some emails to the culver city council members.
http://www.culvercity.org/council/council.asp?sec=gov