A driver was cited by Steamboat Springs police Sunday after interrupting a peaceful demonstration with an obnoxious cloud of dark exhaust.

During Saturday’s Steamboat Springs March for Our Lives event, a blue pickup truck swerved toward demonstrators on the sidewalk and spewed exhaust at them.

Demonstrators took pictures of the incident in which the truck’s license plate was clearly visible.

'March For Your Life" demonstration in Steamboat Springs marred by 'rolling coal' incident, caught on camera by protesters.https://t.co/Ly33Imvgwn#MarchForYourLife pic.twitter.com/PimP2DcWwL — Pilot & Today (@steamboatpilot) March 25, 2018

Sgt. Evan Noble said Sunday that two officers were in the area during the demonstration.The demonstrators told police that multiple trucks had driven by and were “rolling coal.”

Police contacted the male driver of the pickup and and issued him a $113.50 citation.

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