PITTSBURGH (KDKA) — Police are investigating a series of bomb threats at hospitals and stores in Pittsburgh and surrounding areas.

According to police, a man called Children’s Hospital around 9 p.m. Monday saying a bomb on the sixth floor would detonate within two hours. A police sweep found no explosive devices in the building.

A similar call was made to Allegheny General Hospital around 10:30 p.m. Again, no explosive devices were found.

Another call was made to Jefferson Regional Hospital, where incoming patients were diverted to other nearby emergency rooms.

None of the hospitals were evacuated.

Police say their resources were stretched thin as they investigated each threat.

Threats were also called in to two Walmart stores. The stores in North Fayette and Rostraver were both evacuated, but no explosive devices were found.

The Target stores in East Liberty and West Mifflin also received threats.

No arrests have been made, but police are confident they will find the man responsible.They say one of the hospital calls was recorded, so they have the man’s voice on tape.

Police are looking into whether all, or only some, of the calls were made by the same man.

Stay with KDKA for more information.

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