A man with a gun who had been involved in an armed robbery has been reported on the Indiana University-Purdue University campus in Indianapolis, and students are being urged to take shelter, according to the university’s Twitter feed.

Students and faculty were advised to lock their doors if possible, remaining in place until an “all clear” is given, the university said on its website.

The university described the suspect on Twitter as a black male, between 6 foot, 3 inches and 6 foot, 4 inches tall, wearing a black hoodie, blue jeans, and a hat with yellow writing. The situation began as an armed robbery, for which no injuries had been reported, the university said.

No other information was immediately available. The urban public research university has about 30,690 students.