A roadside bomb exploded as a U.S. military convoy traveled along a road on the outskirts of the western Iraq city of Ramadi Sunday, police said. There were no reports of casualties but three persons were arrested after the blast, said Ramadi Police Capt. Fahim Hussein. The Associated Press quoted eyewitnesses as saying that U.S. fire killed one woman in a farm near the scene of the explosion on the eastern edges of Ramadi. About 20 persons were detained, the eyewitnesses said.