A teenage boy has drowned in a pool at Chestnut Mountain Resort in Galena.

A15-year-old boy was unresponsive when he was pulled from the pool around 9:20 p.m. on Sunday, August 4, according to a statement from the Jo Daviess County Sheriff’s Department and listed on WQAD TV.com website.

Multiple people called 911 to report the drowning, said the sheriff’s department.  The teen had gone under water in the swimming pool “for an unknown period of time” before being pulled out.

CPR was performed on the teen before he was taken to a nearby hospital, where he was pronounced dead. Investigators said the drowning was accidental.

Chestnut Mountain Resort is located at 8700 West Chestnut Mountain Road in rural Galena, Illinois.  According to the resort website, the pool is indoor and is included in a facility with a sauna and whirlpool.