commitment of ten years also comes with about $4 billion attached to it. >> chris lawrence, thanks very much. live in washington. yeah. u.s. and japanese authorities investigating two exexplosions that happened outside a usair base. this happened last base near tokyo. bomb squads and police found remnants of improvised explosive devices near the base. karl penhaul with the details. >> a bomb squad on the move. it's just after dawn and japanese authorities are on alert after explosions close to the air force base. police through up a cordon. nearby, residents say they heard two loud blasts just before midnight. >> translator: there was a sound of something exploding. it wasn't something blowing up but more like a sound of rockets