Published: May 12, 2010 5:04 PM EDT

CLEVELAND (AP) - Authorities say an explosion destroyed three homes in Cleveland, damaged at least 12 others and injured at least 11 people, though none seriously.

The blast around 8 a.m. Wednesday demolished an apparently unoccupied home on the city's east side, leaving a hole. Only the chimney remained at an adjacent home, while another had just one wall standing.

Authorities who ordered an evacuation of the area say they're concerned about leaking natural gas. City and federal authorities are trying to determine the cause of the blast.

Fire department spokesman Larry Gray says the injuries were minor, mostly burns. MetroHealth Medical Center says it received six adults and five children from the scene. People living in suburbs at least 10 miles away say they felt the explosion.