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Fire forces evacuation of Old City office building

A fire forced the temporary evacuation of an office building at Third and Chestnut Streets in Old City Thursday morning, officials said.

Philadelphia fire department was called to a fire at the Cosi restaurant at 325 Chestnut St. in Old City on Thursday, Sept. 5, 2013. ( ALEJANDRO A. ALVAREZ / STAFF PHOTOGRAPHER )
Philadelphia fire department was called to a fire at the Cosi restaurant at 325 Chestnut St. in Old City on Thursday, Sept. 5, 2013. ( ALEJANDRO A. ALVAREZ / STAFF PHOTOGRAPHER )Read moreDN

A fire forced the temporary evacuation of a 20-story office building at Third and Chestnut Streets in Old City Thursday morning, officials said.

No injuries were reported in the blaze inside the Cosi Restaurant on the ground floor of the building at 325 Chestnut St.

Firefighters were called to address shortly before 9:30 a.m. and quickly doused the flames.

The cause of the fire is under investigation.

Workers were allowed to return to the building.

The restaurant Buddakan also is on the building's ground floor.