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Authorities say they're not sure what caused a water pipe to break, but hundreds of gallons of water flowed into the Norwalk Nursing and Rehabilitation building through weak spots in the ceiling Thursday.

Officials say the leak came from a disconnected pipe that supplies water to the sprinkler system. For about 15 minutes that pipe released water into the ceiling. It happened around noon. No injuries have been reported. Ambulances from all over the metro were called to help evacuate roughly 40 residents.

Norwalk Nursing and Rehabilitation Center would not comment other than stating that its number one priority is the safety and well-being of its residents. Officials estimate it will take days if not weeks before things will be back to normal at the center.