Boulder police are investigating a report that a 20-year-old University of Colorado student was attacked and robbed at knifepoint over the weekend.

Police spokeswoman Sarah Huntley said the man told officers that he was walking alone at 1:30 a.m. Saturday in the 1600 block of 17th Street when two Hispanic males approached him.

The men, described as about 21 years old and wearing all-black clothing with hooded sweatshirts pulled over their heads, were walking in the opposite direction near 17th Street and Arapahoe Avenue.

Huntley said the men stopped as they approached the CU student and one of them pulled out a knife and held it at the man's stomach. The knife-wielding man told the victim to “give me your money,” according to Huntley.

“He said he didn't have any money, but had a cell phone and lighter,” Huntley said.

That's when one of the men punched the student in the face. He fell to the ground, and both suspects began kicking him, Huntley said.

The men grabbed the cell phone from the victim's hand and ran off toward University Avenue.

The student, left with bruises and cuts, made his way to a friend's nearby house to call police. When his friend wasn't there, Huntley said, he went home to use his roommate's cell phone. The roommate also wasn't home, so the man waited until about 9 a.m. for him to arrive before finally calling authorities.

Boulder detectives are investigating, and are asking anyone who might have seen the incident or the suspects to call 303-441-3333.