Pitt evacuated Litchfield Towers after a bomb threat to the dormitory on Thursday… Pitt evacuated Litchfield Towers after a bomb threat to the dormitory on Thursday evening.

Around 10 p.m., a Pitt Emergency Notification System alert advised people to evacuate Towers A, B and C. This brings the bomb threat count to 24 this semester. The building reopened just before 1 a.m.

This is the third time Pitt has evacuated Towers this week. On Wednesday around 5:30 p.m., Tower C received a bomb threat. After 2 a.m. Tuesday, Litchfield Towers received its first bomb threat, forcing all students to evacuate for two and a half hours.

Police on scene Thursday would not comment on the Towers threat.

Kenyon Bonner, the associate dean and director of student life, said that he had no further information outside of the ENS alert.

Resident Advisors sent students to David Lawrence Hall, Posvar hall and the William Pitt Union. Litchfield Towers is home to more than 1,800 students.

One Tower B resident, freshman Nikki Branhut, said that it was the second time she had been forced to evacuate her room on the 15th floor. While she praised the efficiency of the evacuation, she did comment on the fear that repeated bomb threats create.

“It’s scary because you don’t know,” she said. “You just don’t know if it’s real or not.”

Earlier Thursday, four buildings on lower campus — Posvar Hall, the Cathedral of Learning, the Chevron Science Center and the Frick Fine Arts building — were evacuated after a bomb threat was received.

All four threats were cleared at around 12:20 p.m.