Today's bombing outside coalition headquarters in Baghdad will not deter U.S. and coalition forces from their mission in Iraq, a military spokesman said in a briefing from the Iraqi capital. An explosives-laden truck exploded shortly after 8 a.m. during Sunday's morning rush hour near the entrance to the headquarters. At least 20 people were killed, and at least 60 more were injured. Officials believe most of the dead were Iraqi citizens, but Army Brig. Gen. Mark Kimmitt, deputy director of operations for Combined Joint Task Force 7, said two Americans may have been killed by the blast. "We have indications...