An 18-month-old Kailua-Kona boy apparently drowned Friday morning in a large plastic tank filled with water.

Hawaii County police said the toddler’s 30-year-old mother reported at 8:58 a.m. she had been watching her son playing in a vacant lot, turned away for a few seconds, and her son was gone.

She also told police that after searching for 10 to 15 minutes, she found him floating face down in the tank.

Officers met the woman on Lamaokeola Street in Kailua-Kona.

Police said the large plastic tank was partially covered when the boy fell in, but would not describe it in detail.

The woman tried to resuscitate her son using cardiopulmonary resuscitation until fire personnel arrived.

They transported him to the Kona Community Hospital where he was pronounced dead at 9:37 a.m.

An autopsy has been scheduled to determine the cause of death.

Police do not suspect foul play.