Part of Interstate 81 in Broome and Cortland counties was closed to northbound traffic following a crash involving two tractor-trailers.

Authorities say a 21-mile section of the highway was shut down between Whitney Point - Exit 8 - and Cortland - Exit 10.

A Cortland County emergency dispatcher said the collision was reported at 3:42 a.m. Tuesday. The scene of the crash was about three miles north of Marathon.

One of the tractor-trailers overturned, blocking both lanes of I-81. All northbound traffic was being detoured onto Route 11.

According to New York State Police, one lane of the highway was reopened shortly before 6:30 a.m.

There was dense fog in the area at the time of the collision but it was not immediately known if that was a factor in the crash.

No injuries were reported and there apparently were no hazardous materials in either truck.

Southbound traffic on Interstate 81 was not affected by the crash.

This story was updated to include new information provided by New York State Police.

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