Ithaca, N.Y. (AP) — Officials say multiple bomb threats made over the weekend at Ivy League campuses were not credible.

Cornell, Columbia, and Brown universities had alerted students to threats Sunday and deemed campuses safe a few hours later.

Evacuations were ordered in some buildings on the campuses.

Yale reported a bomb threat two days earlier that forced the evacuation of several buildings as well as nearby businesses in New Haven, Connecticut. The university resumed normal campus activity Friday evening.

In Ithaca, New York, Cornell police cordoned off the center of campus on Sunday after receiving a call that bombs were placed in four buildings.

Brown University officials in Providence, Rhode Island, sent a text alert to students that said police were investigating “multiple buildings on campus involving a bomb threat.”