GARFIELD COUNTY, Colo. (CBS4)– A portion of Interstate 70 was closed for about three hours on Tuesday during an investigation into a man with a gun. The suspect was apparently involved in an altercation on the highway near Rifle.

I-70 was closed in both directions from West Rifle to Rulison, along with Highway 6 which parallels the interstate. There were no reports of any shots fired.

What started the altercation is being investigated. The I-70 closure began about 11:30 a.m. Lanes were reopened about 2:30 p.m.

The suspect was arrested.