Four U.S. Marines were killed in a Sunni Arab insurgent stronghold west of Baghdad, and pressure mounted in parliament Sunday to replace the interior minister because of the security crisis in the capital. Also Sunday, a U.S. F-16 jet dropped two precision-guided bombs on a building near Baghdad used by militants affiliated with a group believed responsible a mortar-and-rocket attack in Baghdad’s mostly Shiite district of Karradah last week that killed at least 31 people, U.S. officials said. Full Story