PHILADELPHIA — A Philadelphia row house has collapsed, injuring eight people.

The collapse happened late Monday morning in the middle of a block of connected brick homes. Police say witnesses report hearing an explosion.

Bricks showered onto the small south Philadelphia street and nearly cover a car parked out front. The houses on either side of the destroyed home are badly damaged, with huge sections of masonry walls missing.

Gas and electrical utility crews are trying to determine what caused the collapse. Rescue crews are combing through the rubble to see if anyone else may be trapped.

The area is being evacuated.