A woman was killed when her car collided head-on with a tractor-trailer truck on Route 25 in Porter Wednesday, police said.

Donna-Lee Zahn, 50, of Parsonsfield, was killed in the accident, which occurred about a half-mile from the Kezar Falls Bridge at about 12:30 p.m., said Maine Department of Public Safety spokesman Stephen McCausland.

The cab of the truck burst into flames, but the driver of the big rig, Gary Runnells, 32, of Canaan, managed to escape uninjured.

A portion of Route 25 was closed while crews cleaned up the accident.

The investigation into the cause of the accident is ongoing.

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