BOSTON — The city has launched a review of protocols at all of its summer day camps after a 7-year-old boy wandered away unnoticed from a camp at a beach and later was found dead in the water.

City officials and police are trying to piece together what happened in the approximately 30 minutes between the time Kyzr Willis was last seen Tuesday afternoon and when he was reported missing from the Curley Community Center, Mayor Marty Walsh said Wednesday.

The day camp is held at acommunity center in the city’s South Boston neighborhood. It includes a beach bathhouse where the boy was seen. The camp is run by the Boston Centers for Youth and Families.

Willis was last spotted by a lifeguard around 2:15 p.m. Tuesday getting out of the water behind the community center, The Boston Globe reported.

The boy’s body was located around 7 p.m. Tuesday about 15 yards from the shore behind the bathhouse, police Commissioner William Evans said. Police were awaiting autopsy results to determine how long the boy was in the water, Evans said.

The boy’s mother, Melissa Willis, told the Globe that nobody at the camp notified her he was missing and that she found out through her 9-year-old niece.