PHILADELPHIA (CBS) — Saturday evening, Lafayette College is asked those on campus to stay where they were and those off campus to stay away while they investigated the legitimacy of a threat they received.

Police: 1 Dead Following North Philadelphia Shooting 

READ MORE: 21-Year-Old Killed In Road Rage Shooting On Roosevelt Boulevard, Police Say

Someone claiming to be a student posted on social media that he pledged his allegiance to ISIS and was planning an attack on campus.

The college posted on Twitter around 9:30 Saturday evening.

That led the FBI,  Easton Police, and other agencies to inspect all buildings.

READ MORE: 2 Found Dead Outside Home In Tacony Neighborhood, Philadelphia Police Said

The college says an extensive room to room search found nothing dangerous.

There was no lockdown.

The investigation continues.

MORE NEWS: New Area Code Approved For Some Pennsylvania Counties As Current Phone Numbers Run Out

Investigators ask anyone with information that may be helpful to investigators, or who sees something suspicious, to contact the FBI at 215-418-4000.