Divers are searching Lake Natoma late Friday for a man believed to have drowned near the CSUS Aquatic Center off Hazel Avenue.

Capt. Bryan Thomson of the Sacramento Metropolitan Fire District said a group of young men were at the lake about 8:10 p.m. when one man swam out to retrieve a ball in the channel. He began having difficulties and another member of the group tried to come to his aid as he went under water, but was unable to rescue him.