The district expects radon results for the three schools Tuesday. South of Portland, Milwaukie High School will reopen Tuesday. Last Friday, a prank forced school officials to shut down, forcing the evacuation of 1,300 students. Someone doused hundreds of lockers with a foul-smelling chemical. The North Clackamas School District said if any students took part in the prank, they possible suspension, expulsion or even criminal charges.
Police have no suspects.