BAGHDAD, Iraq — In the deadliest day for American forces since the beginning of the year, at least nine members of the military were killed in the insurgent stronghold of Anbar Province, including four in a rebel attack and at least five when their truck accidentally flipped over, the American military command said Monday. Three marines and one sailor were killed Sunday in the rebel assault, the military reported, offering no further information. It was the largest number of American deaths in a single attack in more than a month. In another part of Anbar on Sunday, a flash flood toppled a seven-ton truck, killing five marines riding inside it and wounding one, the military said. Two marines and one Navy corpsman in the truck were missing, officials said. Wrapping up a quick visit here, Secretary of State Condoleezza Rice and Jack Straw, the British foreign secretary, pressed Iraqi leaders for a second day on Monday to form a coalition government as quickly as possible, in order to end a power vacuum in which insurgent attacks, sectarian violence and general lawlessness have flourished. Underscoring their concerns, three car bombs exploded in predominantly Shiite neighborhoods of Baghdad, […]