WASHINGTON - American University was locked down Wednesday evening for the report of a man with a gun on campus.

The university and D.C. police both tweeted around 9:20 p.m. that the lockdown was lifted and no students were hurt. American University tweeted one person was in custody.

A Metropolitan Police spokesperson said a person on the university bus saw a person with a holster and called it in. There was no crime, and no display of a weapon, according to Metropolitan police. Police believe the person was an off-duty police officer.

The university tweeted the lockdown and shelter in place shortly before 8 p.m. Wednesday.

American University and D.C. police were investigating near Gray Hall on Nebraska Ave. AU police tweeted a photo of two people and urged anyone who had seen them to call police. Metropolitan police said the photo was taken by the person who called in the report.