Clovis Unified officials are calling families in the Buchanan High School area to warn them about attacks that have occurred three times in recent weeks on or near the campus.
In two of the three attacks, which occurred on Halloween, the assailants accused the victims, who were dressed in clown costumes, of an affiliation with a gang that favors clown make-up, police said.
The third attack occurred last Saturday near the tennis courts at Buchanan High School when a 15-year-old was knocked off his bike by up to six assailants, beaten and his bike stolen, Clovis police said.
All three attacks occurred between 8 p.m. and 10 p.m. when school district police were not on duty.
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Clovis police say will increase patrols in the neighborhood, and they have re-interviewed victims to learn more about what occurred in those incidents.
None of the injuries were life-threatening but one of the victims was taken to the hospital.