HAMMETT, Idaho (KTVB)- Both lanes of Interstate 84 were closed for hours overnight after a semi truck, which was hauling hazardous materials, caught fire.

It happened at about 2:40 a.m. on the westbound side of the interstate, about five miles west of Glenns Ferry. Idaho State Police have not said what the hazardous material was, but say they evacuated the area and blocked I-84 to traffic in both directions.

In addition to ISP, emergency crews from Elmore County and the Idaho Transportation Department responded to the scene. The eastbound lanes were opened by 4:30 a.m., police said, and all lanes were open by 2 p.m.