(AP) - Authorities say a 3-year-old New Jersey boy died the morning after he was found unconscious in his home's swimming pool.

The Howell Township police department says officers and emergency medical personnel were called to the home shortly before 5:30 p.m. Sunday and found 3-year-old Lucas Hynes unresponsive.

First responders began resuscitation efforts that resulted in the child regaining his pulse, and he was taken to Jersey Shore University Medical Center, where he later succumbed to his injuries.

Police said he and other children were swimming while supervised, and the group went to the yard and later inside, but the child's mother realized Lucas wasn't present. She found him floating in the pool, got him out and began CPR.

Police and Monmouth County prosecutors called the case a tragic accident.