CNN) -- U.S. forces killed as many as 300 Iraqis Tuesday in a massive battle --possibly the biggest firefight of the war so far -- in the Euphrates Valley east of Najaf, Pentagon officials said.

• 五角大楼官员称，美国军队星期二在位于纳杰夫东面的幼发拉底河谷的激烈战斗-可能是自开战以来最大规模的交火-中击毙了300多名伊拉克人。