Twin three-year-old boys drowned in their family’s backyard pool in Long Island, New York, Wednesday morning.

The Daily News reports that firefighters responded to a home in Melville where the boys’ mother was administering CPR to one of the twins. She reportedly told first responders she did not know where the second twin was.

“Four of our members immediately went into the pool and within a few minutes after being in the pool, because there was very little visibility in the pool, they were able to locate a second child,” Melville Assistant Fire Chief David Kaplan told 1010 WINS. “

“That child was pulled from the pool and we began live-saving treatment on the second child also.”

The twin boys were later transported to a local hospital, but could not be saved.

NBC News has identified the twin boys as Nicholas and Anthony Aurilia, and said the boys, both autistic, are believed to have slipped out the back door of the home while their mother was sleeping. She reportedly began looking for them when she did not find them in their bedrooms in the morning.

A five-year-old boy at the home was unharmed. The parents have not yet been identified.

Neighbors told the Daily News that the family had only recently moved into the home in an upscale, tree-lined neighborhood in Melville.

Long Island Patch reports that while police believe the deaths are likely accidental, Homicide Squad detectives are investigating. Police have reportedly said the home and the pool appear to be compliant with safety codes.

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