PITTSBURGH (KDKA) – Another bomb threat was made against the University of Pittsburgh campus Saturday morning.

Around 7 a.m. the Litchfield Towers were evacuated and police were working to search the building.

Dozens of bomb threats have been made against the campus over the past few weeks, but no arrests have been made in the case yet.

On Wednesday, Pitt officials said that they have made significant progress in the investigation, and are coming up with potential suspects.

U.S. Attorney David Hickton said in a statement that authorities are coming closer to finding those responsible.

The statement reads in part: “We thank the University of Pittsburgh students and community members for the information they have provided so far. The information has helped us to focus upon potential suspects.”

A $50,000 reward is being offered in the case as well.

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