The fire spread to an adjacent home’s roof and damaged several vehicles at neighboring homes where the lawns caught fire. One man suffered a burn when he tried to move his car.

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A fire early Thursday destroyed one SeaTac house that was under construction, damaged a second vacant home, set lawns ablaze and melted vehicles, according to fire officials.

Capt. Kyle Ohashi, of the Kent Fire Department Regional Fire Authority, said the 2:45 a.m. fire was in the 5200 block of South 170th Lane, on a street of new construction.

The fire’s cause has not been determined. It appears to have started in a home that had been framed but was otherwise incomplete, he said.

The fire spread to the roof of an adjacent home that was nearly finished and unoccupied, he said. The blaze also damaged several vehicles at neighboring homes where the lawns caught fire, he said.

One man suffered a facial burn when he tried to move his car, Ohashi said.