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Incendiary devices found at the ballot box fires were marked with pro-Palestinian messages.
The officer who was hit inside the patrol car suffered minor injuries and has since been medically cleared.
Investigators have also linked the Canadian suspect to dozens of threats across 12 states and Canada.
University Police and Bellingham Police both searched the area, but the suspect has not been found.
Incendiary devices were pushed into two ballot boxes, setting a fire in one.
The hearing has been ordered for June 4, and the teen will enter a plea at that time.
Sentencing for the man has been set for Jan. 21.
Whatcom County Sheriff’s and the Whatcom Gang and Drug Task Force had been investigating one of the suspects since the summer.
The suspect made various claims of child physical and sexual abuse, all of which were found to be false.
Following his prison sentence, the offender will be required to register as a sex offender.