Authorities at the University of Minnesota are alerting the public to an attempted armed — and masked — robbery on the Twin Cities campus this weekend. 

According to an update from the school's public safety department, it happened early Sunday morning in the area of East River Parkway:

U of M Twin Cities: Attempted Robbery at 12:45 am near Harvard Street and Delaware. 3 males wearing face masks, 1 had a handgun. Suspects driving a silver sedan. Use caution. Updates and safety tips at z.umn.edu/alerts

No other details about the incident have been released, so it's not yet clear why the suspects drove off in a silver sedan before completing the robbery.

This comes just three days after another attempted robbery on campus; there were at least four such incidents in November.