Officials identify source of mystery odor around Philly as pipe cleaning at PES

SOUTH PHILADELPHIA - The Philadelphia Fire Department responded to multiple odor calls across the city on Thursday afternoon. 

According to officials, a crew was cleaning and disassembling a pipe at the Philadelphia Energy Solutions (PES) in South Philadelphia when the odor was released. State and city agencies detected no potentially volatile substances and the release was stopped.

The fire department's Hazmat Task Force conducted air monitoring and did not detect hydrogen fluoride or other potentially volatile substances.

The refinery is closed following a massive fire on June 21.

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This is a developing story. Check back for updates.