A 21-year-old man has been charged with robbing a student at knifepoint last week on the University of Maryland College Park campus, but a second suspect remains at large, campus police said Sunday.

Isaiah Graham of Riverdale in Prince George's County was being held by Washington, D.C., police on unrelated robbery charges when University of Maryland police found evidence linking him to the attack Thursday evening on the College Park campus, according to a university police news release.

Graham was charged with armed robbery, first-degree assault, theft and lesser charges, according to the police.

Campus police continue to seek a second suspect in the robbery, which they said was the first at College Park in the past 12 months.

Two men wearing masks and dark clothing robbed a male student who was walking alone near College Park dorms just before midnight Thursday, according to the police.

University police said they teamed with D.C.'s Metropolitan police and George Washington Police.

According to news reports, two masked men robbed students on the George Washington campus Friday morning. It was unclear whether the incidents were linked; a College Park police spokesman did not immediately respond to a request for comment.

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