The U.S.-led coalition transferred sovereignty to an interim Iraqi government two days early Monday in a surprise move that apparently caught insurgents off guard, averting a feared campaign of attacks to sabotage the highly symbolic step toward self-rule. Legal documents transferring sovereignty were handed over by U.S. governor L. Paul Bremer to chief justice Midhat al-Mahmood in a small ceremony attended by about a half dozen Iraqi and coalition officials in the heavily guarded Green Zone.