WINDSOR, Colo. - A large tornado tore through several northern Colorado towns on Thursday, flipping over tractor-trailers, ripping roofs off buildings and killing at least one person.

The Weld County coroner's office confirmed one person was killed in the storm, which struck about 50 miles north of Denver. The office declined to provide details about how or where the person was killed.

The storm moved north-northwestward through or near the towns of Platteville, Milliken, Greeley and Windsor. Television footage showed homes and buildings with roofs missing and farm irrigation equipment crumpled.

Windsor, a farm town of about 16,000, appeared the hardest hit. Video footage showed a dark gray funnel perhaps a quarter-mile wide near Windsor with heavy hail and rain.

Splintered wood, mangled metal and other debris cluttered roads, yards and agricultural fields. About 130 children at a daycare center in Windsor were reported safe after the storm passed through; playground equipment outside the center was damaged.

"My house is gone," said Pete Ambrose, a caretaker at a Weld County park outside Greeley. "I lost my dog. I lost my cats. I lost my camper. I lost everything."

Interstate 25, the main north-south highway, was closed to traffic.

Some 60,000 customers lost power in the area, according to XCel energy.

A tornado warning was also issued for an area about 100 miles northeast of Denver, but there were no reported tornadoes.