COUNCIL BLUFFS, Iowa (AP) -- An 11-year-old Nebraska boy has died after being pulled unconscious from the swimming area of a western Iowa lake.

Authorities say the boy had been under water for several minutes at Lake Manawa in Council Bluffs on Wednesday. The incident was reported around 2:20 p.m.

The boy was identified as Isaiah Griffin, who lived at an Omaha homeless shelter with his mother. She didn't go on the shelter-sponsored field trip to the lake.

Officials say the boy was pronounced dead at Mercy Hospital in Council Bluffs.

Council Bluffs Police Sgt. Dave Dawson says the boy's death appears to be accidental, but it is being investigated.

Police Lt. Mark Galvan says lifeguards were on duty.