FORT LEE, N.J. (CBS 2/WCBS 880/ AP) – The upper level of the George Washington Bridge into New York City reopened to traffic nearly four hours after a multi-vehicle wreck Monday morning.

Motorists experienced major delays throughout the morning rush.

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Traffic had been at a standstill after the accident. Port Authority spokesman Ron Marsico said the inbound lanes were closed following a crash involving seven tractor-trailers and a car under the apartments at 3:15 a.m. Monday.

Marsico said there was one minor injury.

Workers had to clean up fuel and antifreeze from the bridge deck before reopening the upper level around 7:07 a.m.

The cause of the crash is under investigation.

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