Raleigh, N.C. — Police at North Carolina State University have identified a suspect in an armed robbery on Centennial Campus Tuesday afternoon.

He is a black male in his mid-20s, about 5'10" and 150-160 pounds. At the time of the robbery, he was wearing a black ski mask, a black ribbed sweater, desert camouflage pants and tan or grey work gloves.

Campus police have been especially alert after the week began with two armed robberies in two days.

Investigators said the suspect and another man demanded money from a graduate student as he was leaving a building on the Centennial Campus late Tuesday afternoon.

Two male students told police they were near 2110 Avent Ferry Road at about 9 p.m. on Monday when a man wearing a mask and armed with a knife robbed them.

"It's very concerning, not only to us, but to the campus community," said Capt. Jon Barnwell, with NCSU police.

Police have not confirmed that the two cases are related, but they are looking at the possibility.

There have also been several recent break-ins at campus-area apartment complexes. The Avent Ferry Complex had as many as five robberies last week.

Natasha Herting, who is running for student body president, said burglars broke into her College Inn apartment while she and her roommates were sleeping.

"It was really scary just to think that you have no control – that someone could be in your apartment and you have four girls alone,” she said.

N.C. State students with whom WRAL spoke said the recent rash of crimes has them on alert.

“I'm thinking whether I’m safe walking down to my lab or not,” Devesh Diwari said.

“Yeah, it’s definitely alarming. Definitely walk in groups, that's what I would say,” Zach Fitzgerald said.

Campus police are on heightened patrol in wake of the recent incidents. They have asked anyone with information that could help in the investigations to contact the North Carolina State University Police Department at 515-3000.