Between 10 and 15 non-students caused a melee at a Stanford University fraternity party last weekend, leaving eight students with minor cuts and bruises.
The non-students arrived at Theta Delta Chi at 1:30 a.m. Saturday, a half hour after the party was to have ended and a half-hour after hired security personnel left the party, according to university officials.
Only people with Stanford IDs are allowed into Stanford parties.
Stanford police arrived at the fraternity after multiple 911 calls were made, pursuing and arresting three of the intruders. The names of those arrested have not been released yet.
The outsiders may have taken possessions from the students. No weapons were brandished at the party.
"Although crimes that involve any level of violence are rare on our campus, Saturday's incident reminds us that we are not immune from criminal activity that jeopardizes the safety of members of our community," said Chris Griffith, associate vice provost for student affairs.