A 6-year-old boy drowned in a supervised pool while at a birthday party on Friday evening at Oak Ridge Country Club in Hopkins.

The boy was spotted unresponsive in the water by a lifeguard, and country club employees and members were performing CPR on him when police arrived. He was taken to Hennepin County Medical Center in Minneapolis, where he was pronounced dead.

Hopkins police Sgt. Michael Glassberg said it was not clear what led to the drowning and said he knew of no issues with equipment safety at the pool. The pool has deep and shallow ends, a slide and other features. Glassberg said he didn't know how deep the water was where the boy was found.

The drowning is under investigation by Hopkins police and the Hennepin County sheriff. "This is obviously a tragic situation," Glassberg said. "We just want to remind people about pool safety. Summer's here. We just need to make sure we're being safe."