Behind the scenes: Capturing the holiday bustle inside Philadelphia's USPS facility

PHILADELPHIA (WPVI) -- The elves are busy sorting and packing hundreds of thousands of pieces of mail ahead of the holidays.

On Tuesday, workers at the USPS facility near the airport were graced by the sweet soul sounds of the Philadelphia Postal Choir.

Action News photographer Tom Kretschmer was there to capture all the sights and music of their busiest time of year.