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A deadly crash on the 101 Freeway in Sherman Oaks led to the arrest of a box truck driver and the temporary closure of all eastbound lanes Monday morning.

The crash occurred shortly before 2 a.m. near Van Nuys Boulevard when an SUV collided with the back of a box truck that was stopped on the freeway, California Highway Patrol Officer Ramstead said.

The driver of the SUV, described as a man between 30 and 40 years old, was pronounced dead at the scene, Los Angeles Fire Department spokesperson Margaret Stewart stated in a news alert.

It was unclear why the box truck stopped on the freeway, but authorities later arrested the driver on suspicion of DUI, Ramstead said.

Thick fog in the area may have hindered the SUV driver’s ability to see the stopped truck.

All eastbound lanes were closed as officials conducted an investigation.

One lane had reopened by 4 a.m., video from the scene showed. The freeway was completely reopened by 5:40 a.m., according to a CHP tweet.

No other injuries were reported in the crash.