(Portland, OR) -- A Tillamook County man has been sentenced to federal prison after being stopped in a stolen vehicle and possessing explosive materials inside of a metal bottle. Police stopped 36-year-old Robert Larsen in Cornelius last year and searched his vehicle to find several catalytic converters in the trunk along with metal bottle with explosive material inside and a detonation cord inserted through the cap. Larsen was sentenced yesterday to 15 months in federal prison.