According to witnesses, the cyclist got off his bike and shoved the elderly pedestrian backwards onto the roadway. The victim hit his head on the pavement, but was conscious with minor injuries when medics arrived.
The cyclist told witnesses he and the victim had a confrontation earlier.
The victim told police he had told a cyclist to ride in the bike lane and not on the sidewalk. The victim was not sure if the suspect was that same cyclist.
Police are on the lookout for the cyclist, who has been described as a male in his 30's. A quick-thinking witness took a photo of the cyclist. As of Friday night, the suspect is still at large.
Anyone with information is urged to call Whatcom dispatchers at (360) 715-7459, or toll free at 1-866-456-2157.