Protest Diesel Smoke

A truck spews thick, black diesel smoke as it's driven past protesters at a women's march in Coos Bay on Jan. 21, 2017. The practice is referred to as "rolling coal."

(Bethany Bishop/The World via AP)

COOS BAY -- An Oregon man has been accused of driving by a women's march and intentionally blasting diesel fumes at demonstrators.

Coos Bay police Capt. Chris Chapanar tells The World newspaper that Steven Bishop of Lakeside was cited Monday for unlawful visible emissions after he confessed. The phenomenon is called "rolling coal."

The women's march in Coos Bay drew hundreds on Saturday. The night before, Bishop wrote on his Facebook page that there was supposed to be a riot, and "I hope all you diesel guys are ready to go blow black smoke."

He posted a video of diesel smoke that included the caption: "What the rioters are going to get tomorrow."

Reached by the newspaper, he initially denied being in town. Shown a photo of his truck at the march, he wrote that one of his buddies must've been driving it. He later posted a photo of his $110 citation.

Sgt. Pete Simpson, a Portland police spokesman, said he hasn't heard of any rolling coal complaints from Saturday's downtown march, which drew an estimated 70,000 to 100,000 people.

"I've seen some tweets about it now and then (usually from the bicycle community) but that's about it," Simpson said in an email.

-- The Associated Press

Tony Hernandez of The Oregonian/OregonLive staff contributed to this report