Massachusetts police said on Friday that a 4-year-old girl who vanished on Thursday is dead.

The girl — only identified as Eva — was pronounced dead after she was discovered in a neighbor’s pool in Sutton. The Boston Globe reported that Eva was autistic, and someone had called 911 after realizing she had left home.

“The past 12 hours have been incredibly difficult for one of our families in town and our team of first responders,” Sutton police said in a statement. “There are no words that we can offer to help ease the heartache of our residents our feelings no. We are so incredibly sorry.”

Officials have not provided specifics regarding Eva’s disappearance and death. An investigation is ongoing.

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[Featured Image: Sutton Police Department]