A man in a mask assaulted and robbed a victim Thursday morning outside a University of Minnesota residence hall, school officials said.

The attack occurred about 10:15 a.m. at Territorial Hall in the 400 block of SE. Walnut Street, according to a safety alert sent campuswide.

A masked male suspect in a black coat and bluejeans punched the victim, stole a wallet and fled on foot, the alert said.

No arrests had been made as of Thursday afternoon, said U spokeswoman Caitlin Hurley. The victim is not affiliated with the university, she said.