PITTSBURGH (KDKA) — Frustrations are growing on the University of Pittsburgh campus as the bomb threats keep coming.

Students were notified that the university received a bomb threat Wednesday for the Cathedral of Learning, Posvar Hall and Litchfield Tower C just before 5:30 p.m.

All three buildings have been evacuated.

Earlier today, a threat was made against Thackeray Hall.

On Tuesday, students living in the Litchfield Towers had to get out in the middle of the night after a threat was emailed to a Pittsburgh post-Gazette reporter.

Police say it came from an anonymous “re-mailer,” and is nearly untraceable.

A few hours later there was another threat at the Chevron science building, and by the afternoon, a third at the Cathedral of Learning, again.

There have now been 13 bomb threats at Pitt in recent weeks.

Pitt is offering a $50,000 reward for information.

The Pitt police chief says they will pursue federal charges against whoever is responsible.

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