SIOUX FALLS (AP) - A school bus with no students aboard crashed into two houses in Sioux Falls.

The incident happened shortly after 7:30 a.m. Tuesday. Crews shut off natural gas to one of the houses because of a leak.

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Police say the bus hit one house, then crossed the street and crashed into another house. The 66-year-old driver told authorities he blacked out and doesn't remember anything. He was taken to a hospital to have a head injury checked. He wasn't immediately identified.

No one in the houses was hurt. Twenty-six-year-old Kara Avery was in a room near a bedroom where the bus came to rest. She tells the Argus Leader that she initially thought the noise was thunder. - until she smelled burning rubber and oil.