The discovery of a “suspected improvised explosive device” Thursday led Helena police, school authorities and a student organizer at Helena High School to cancel a walkout that had been planned as a protest against aggressive Immigration and Customs Enforcement activities. The device consisted of a jug of gasoline and fireworks, according to a statement from Helena Public Schools. The corner of Dakota and Davis is behind the Capital City Health Club, which is across Montana Avenue from the high school. She also said she planned to join another protest planned at the state Capitol Thursday afternoon. Nonetheless, he wrote “the Helena Police Department (HPD) advised that student organized walk-outs be cancelled in an abundance of caution for all students’ safety.”