ATLANTIC CITY, N.J. — Nearly $21,000 is missing after the cash fell from the roof of an armored truck that had picked it up from a soon-to-be-closed Atlantic City casino.

GardaWorld armored car services picked up the cash at Revel on Aug. 6.

An incident report obtained by The Press of Atlantic City says surveillance video showed the bag holding the cash on the rear driver’s-side roof as the truck left Revel. The bag was still on the roof when the truck pulled away from nearby Resorts Casino Hotel.

It’s not clear where the bag fell off.

GardaWorld spokesman Joe Gavaghan says the company is investigating and cooperating with law enforcement.

Revel will close its hotel on Sept. 1 and its casino on Sept. 2 because of financial problems.