By Dan Wing

PHILADELPHIA (CBS) – Two military facilities in Philadelphia were evacuated this morning after officials received what they called “a credible threat.”

The threat was reportedly made about 10:30am, and the Navy Yard, in South Philadelphia, and the Naval Support Activity facility (part of the Defense Logistics Agency), in the city’s Lawncrest section, were both evacuated and employees sent home for the day.

The official Twitter account of the Navy Yard sent out the following tweet:

About 90 minutes later, Philadelphia Police called the threats “unfounded” and called off their emergency response.  Still, with the facilities shutting down for the day, cars continued to stream out of the exits as workers left.

(Traffic enters and leaves the gate of the Philadelphia Navy Yard, on Broad Street in South Philadelphia, after an "all clear" was given.  Navy officials alerted police to what was termed "a credible threat" to two Navy installations in Philadelphia.  Some two hours later, police say federal officials gave a "stand down" order saying the threat was not believed to be credible after all.  Photo by Mark Abrams)

(Traffic enters and leaves the gate of the Philadelphia Navy Yard, on Broad Street in South Philadelphia, after an “all clear” was given.  Photo by Mark Abrams)

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Police say federal officials gave a “stand down” order, saying the threat was not believed to be credible after all.

Chelsea Karnash, Pat Loeb, and Mark Abrams contributed to this report.