Calgary police are looking for a man who was last seen swimming in the Bow River on Wednesday.
Derek Blackrider, 37, was with friends when he went into the river at Shouldice Park at about 5 p.m. MT.
They lost sight of him shortly afterwards.
An extensive search that included the fire department’s aquatics team and a Calgary police HAWCS helicopter did not locate the man.
Blackrider is native, five feet eight inches tall, 150 pounds and was wearing a red shirt and dark jeans when he was last seen.
Anyone with information on his whereabouts is asked to call police or Crime Stoppers.