COEUR D'ALENE, Idaho -

A man was knocked unconscious and robbed late Friday night on the Centennial Trail in Coeur d'Alene.

Around 10:45, 59-year-old David Dill was walking along the trail near Atlas Road when a man came up behind him on a bicycle and struck him on the head.

That man took Dill's money while he was unconscious.

Dill says he was knocked out for about 20 minutes before he was able to call 911. He was taken to Kootenai Medical Center with minor injuries.

Several deputies searched the Centennial Trail and surrounding areas, but were unable to locate a suspect.

The Kootenai County Sheriff' Office is still investigating this attack. They are also asking citizens to remain vigilant when using trails and to report any suspicious activity.