Updated, Dec. 7, 12:30 p.m.

The University Police Department is investigating an an elderly who was caught watching pornography in Gelman Library, the unit’s leader said Tuesday night.

“Students called in a complaint of a man viewing pornography, possibly of children,” UPD Chief Kevin Hay said. Officers barred the man, in his late 60s, from campus.

Metropolitan Police also responded to the scene to assist UPD, Hay said, but the man was not arrested.

Hay said evidence for the case is “not conclusive” based on materials “recovered and observed thus far” and the investigation is continuing.

Officers originally thought the man was an alumnus but later discovered he was not.