A Santa Rosa 18-year-old was arrested after posting what he called a “joke” bomb threat Wednesday to a Yolo County high school, authorities said.

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Sonoma County sheriff’s deputies were alerted around 11:30 p.m. Wednesday that someone had commented, “I’m bringing a bomb to school tomorrow,” on an Instagram post from Pioneer High School’s after-school programs account, Sgt. Juan Valencia said.

Police in Woodland — where the school is located — contacted Sonoma County deputies because the comment came from a Santa Rosa account. Deputies found the 18-year-old at his home and searched the property but did not find any bomb-making materials. The man told investigators he made the post “as a joke,” according to the Sheriff’s Office.

He was arrested and booked into the Sonoma C

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