A passenger bus collided with a pickup truck in western Kansas, killing one person in the pickup and injuring several people on the bus.

The patrol says the accident happened early Wednesday as the Greyhound bus and pickup truck were headed east on Interstate 70 in Trego County.

Patrol spokesman Tod Hileman says investigators are working to determine what caused the accident. He says the victim was in the pickup, which was also hauling a trailer. The victim’s identity hasn’t been released.

Greyhound spokeswoman Lanesha Gipson says the bus was headed from Denver to Kansas City, carrying 42 people, including the driver. Gipson says 16 people on the bus were transported to hospitals, and three remained hospitalized later Wednesday.

Greyhound sent another bus to pick up the passengers.