The Missouri State Highway Patrol launched a manhunt Monday after a Christian County deputy was shot and killed that afternoon.

No suspect has been identified so far, but authorities have described the suspect's vehicle as a white 2001 Chevrolet Silverado extended cab pickup truck with Missouri license plate 9MGX36.

Authorities told Fox News that the truck was seen in the area of the shooting and was last reported traveling southbound on U.S. Route 160 from Route HH in Christian County, which eventually crosses south into north-central Arkansas.

"This is a devastating loss in Christian County," Missouri Republican Sen. Eric Schmitt said on X. "As local law enforcement works to bring the suspect to justice, my prayers are with the deputy’s loved ones and those who served shoulder to shoulder with him to keep Missouri safe."

The identity of the deceased deputy has not been revealed, but the incident occurred just before 4 p.m. local time.

Officials are urging anyone who sees the vehicle to stay away from it and to call 911 immediately.