JACKSONVILLE, Fla. – A 3-year-old boy whose body was found in a tank at an Arlington city park drowned, according to investigators with the Department of Children and Families.

Amari Harley was reported missing Oct. 22 after he disappeared while playing at Bruce Park, where his family was attending a birthday party. His body was found later that night in an underground sewage tank at the park.

DCF was involved in the investigation into Amari's death, and official records now show his cause of death was “drowning.”

Police have said from the beginning that no foul play was suspected in Amari's death. But whether safety measures were in place to prevent the boy from falling into the tank remains unclear.

Amari was reported missing about 4:30 p.m., and the search grew to involve dozens of officers, citizens and a helicopter. A Florida Missing Child Alert was issued at 7:15 p.m.

Police called Public Works about opening a water tank at the park and confirmed it was large enough for Amari to get in. The tank was drained Amari's body was found at 7:50 p.m.

City officials said the underground tank in which Amari's body was found is part of the lift station of the septic system for restrooms at the Bruce Park in Arlington.

If the tank access was not secure, it would be at least the third time since April 2016, according to records obtained by the I-TEAM.

City workers screwed makeshift wooden covers onto the openings to the tank the day after Amari died. Plastic or fiberglass coverings that some residents reported had covered the opening previously were sitting by a nearby trash can. The plywood was soon replaced with a concrete lid.

Police said they were searching for surveillance video that could show how Amari got into the tank.

The boy's death sparked calls for change from Mayor Lenny Curry, who initiated inspections of all similar tanks at Jacksonville parks and said he wants the covers and safety measures around the tanks standardized across the city.

After Amari's death, the I-TEAM got records for all the park septic tanks in the city and visited them in person. Records show an inspection on Oct. 31, after the boy drowned, noted that the pumps needed to be replaced at Bruce Park.