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Northbound lanes of the 170 Freeway reopened Thursday morning after a truck fire in North Hollywood caused an hourlong closure, authorities said.

Four lanes were blocked off after a 30-foot box truck caught fire at about 4:40 a.m., just south of Oxnard Street, according to California Highway Patrol.

Flames were seen coming from under the hood, CHP said.

The Los Angeles Fire Department responded to the scene and lanes reopened at about 6:40 a.m. after the truck was towed off the roadway.

It’s unclear what caused the fire and no further details were immediately available.