A former U.S. soldier has been arrested in connection with the failed bombing of a Martin Luther King, Jr. Day parade march in Spokane, Washington, earlier this year. Kevin William Harpham could face life imprisonment on charges of attempting to use of a weapon of mass destruction and possession of an unregistered explosive device. The bomb was found in a backpack along the parade’s route. Investigators say it was equipped with a remote control detonator and shrapnel and positioned to direct its blast toward the marchers. The Southern Poverty Law Center, a nonprofit that tracks hate groups, has identified Harpham as a one-time member of the white supremacist National Alliance.