KUSA – A Kenworth semi-truck towing a trailer caught fire Tuesday morning while driving along Interstate 25.

A gas tank attached to the semi also caught fire, sending thick, dark smoke into the air.

It happened shortly after 11 a.m. at Highway 56 and I-25, near Johnstown.

Colorado State Patrol says no one was injured. The cause of the fire is still under investigation

CSP, Johnstown Fire, and Johnstown Police were all called to help.