In this image from video provided by KMBC-TV, an aerial view shows a suspect's pickup truck which was stopped by Highway Patrol on Interstate 70 west of Topeka, Kan., Monday, July 25, 2011. The suspect was returned to Junction City for questioning by police and the FBI, while the interstate was closed in both directions to keep other vehicles away as authorities prepared to inspect the truck for hazardous materials.

Topeka ? A 50-year-old Arkansas man was under arrest Monday after a hazardous materials incident prompted the closing of about 20 miles of Interstate 70 west of Topeka.

The closing began around 1:15 p.m. Monday and the highway was not reopened until about 10:30 p.m.

Police in Junction City, about 60 miles west of Topeka, said the incident began when someone called 911 at midmorning Monday saying hazardous materials had been placed in a room at a Ramada Inn and the FBI should be called. The motel was evacuated while fire and hazardous material crews investigated.

The Topeka Capital-Journal identified the man as Christopher Spence, of Conway, Ark.

Police issued a description of a suspect and vehicle, and the Highway Patrol stopped a pickup truck on I-70 west of Topeka. The truck had anti-government statements covering the top and sides, the Capital-Journal reported.

While the suspect was returned to Junction City for questioning by police and the FBI, the interstate was closed in both directions to keep other vehicles away as authorities inspected the truck.

Aerial views from TV news helicopters Monday evening showed a robot approaching the truck, its bed packed with containers of various sizes.

FBI spokeswoman Bridget Patton said the bureau’s hazardous materials vehicle was sent to the scene at the request of Kansas officials. She said late Monday night that no explosives were found in the truck.