Over 200 bricks fell onto the pavement when part of a house in Wednesbury in the West Midlands collapsed.
The dorma roof of the traditional brick built semi detached collapsed and one car was damaged and three BT telephone lines were cut as a result of the falling debris.
West Midlands Police closed Rooth Street for a time and a cordon has also been placed around the property.
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The boy, 7 and girl, 4, were pulled from the rubble by the fire service and airlifted to Birmingham Children's hospital.