It broke out just after 4 a.m. on the 6800 block of New State Road.
The warehouse is said to be full of vehicles and tires.
Action News has been told 60 apparatus/trucks responded to the scene, along with 175 firefighters.
They are drafting water out of the Delaware River, using three marine units operating in the river, to help spray the building with water.
The fire was placed under control around 7:15 a.m.
Fire crews have not reported any injuries.
The Fire Marshal's Office is investigating to determine the cause and origin.
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