HOUSTON -

A police officer was taken to the hospital after getting rear-ended while monitoring a crash scene Thursday morning.

Investigators said the officer was sitting in his police cruiser, waiting for crews to clean up a three-car accident on the Katy Freeway near Eldridge Parkway.

Around 2:30 a.m., a white minivan smashed into the back of the officer's squad car.

The driver of the van later told investigators that he was drowsy and didn't notice the cruiser parked on the freeway. Police took the man into custody to ensure he wasn't intoxicated at the time of the crash.

The officer was taken to the hospital to be treated for minor injuries.