Two UA buildings were evacuated this weekend after two separate bomb threats were called into the University of Arizona Police Department, police reported.

The Economics building was evacuated for more than three hours Friday, and the Student Union was evacuated for about 20 minutes at about 5:40 p.m. last night, police reported.

“”Usually we have a lot of that around finals,”” said UAPD Cpl. Joseph Rocco.

Friday’s threat was called in by the suspect’s sister after the suspect called her, said UAPD Sgt. Brian Seastone.

The suspect’s sister called police at 9:56 a.m. Seastone said.

The building reopened at 1:30 p.m. Frday, after a UAPD bomb dog and bomb technicians were brought into the building to investigate, he said.

There are no suspects in the last nights Student Union incident, Rocco said. The caller indicated the bomb was in an air duct in the Cactus Lounge and would explode between 5:30 p.m. and 6:00 p.m. he said.

More precautions were taken with Friday’s threat than in other bomb threats because of specific information police received in the phone call, Seastone said. He refused to elaborate.

No motive is known at this time, he aid.