FREDERICK, Colo. — A Weld County Sheriff’s deputy was injured early Wednesday when a tractor-trailer collided with his patrol vehicle on Interstate 25, according to the Colorado State Patrol (CSP).

The crash happened around 4:13 a.m. near milepost 236, where the deputy was parked on the right shoulder behind an unoccupied vehicle that was about to be towed following a DUI arrest, CSP said.

A tractor-trailer traveling southbound struck the deputy’s vehicle, then veered off the road and into a ditch between I-25 and Frontage Road. A hazmat team responded to contain a fuel leak caused by the impact.

The deputy was transported to a hospital, though officials have not released details about his condition. The truck driver was not injured in the crash.

According to 9NEWS, only one southbound lane of I-25 remained open during cleanup, and all lanes were fully reopened around 6:30 a.m., according to COTrip.org and 9NEWS.