Philadelphia Fire Department Still Trying To Determine Source Of Mysterious Odor In Center City

PHILADELPHIA (CBS) -- The Philadelphia Fire Department is still trying to figure out what caused a mysterious odor in the city on Monday. The strong smell filled buildings and sent people into the streets as offices were evacuated.

The fire department received hundreds of calls.

After investigating, they assured the public it was not natural gas and the odor wasn't coming from the old PES refinery.

The investigation continues.

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