Explosions rocked the Sunni insurgent stronghold of Fallujah early Wednesday, killing two people, hospital officials and witnesses said. Witnesses said U.S. warplanes swooped low over city several times before dawn and again hours later. The U.S. military had no immediate comment. Iyad Muhsin of the Fallujah General Hospital said two Iraqis were killed in the blasts. He had no immediate reports of any injuries.