HADITHA, Iraq - U.S. troops pushed through streets sown with bombs Tuesday in their biggest operation this year in western Iraq, seeking to retake three Euphrates River towns from al-Qaida insurgents. At least five U.S. service members have been killed in the fighting. Operation River Gate — launched at the start of the holy month of Ramadan — was the second U.S. offensive in a week in Anbar province, near the Syrian border. Al-Qaida in Iraq called for intensified attacks on U.S. and Iraqi forces during the Muslim period of fasting, which started Tuesday for the nation's Sunnis. Blasts from...