U.S. military spokesman Brigadier General Mark Kimmitt said the attack targeted "a suspected foreign fighter safe house."  "We estimate that around 40 were killed," he said.  Munif Abdullah, who said he witnessed the attack, told Reuters in the regional capital Ramadi: "They hit the cars and houses. They even hit the families running away."  Major General James Mattis, commander of the U.S. 1st Marine Division which controls the area, told reporters: "How many people go to the middle of the desert 10 miles from the Syrian border to hold a wedding 80 miles from the nearest civilization?  "These were more than two dozen military-age males. Let's not be naive... Bad things happen in wars."  U.S. commanders say the western desert, where smuggling is common, has become a route for foreign fighters, including al Qaeda-linked militants, to enter Iraq from Syria. FEW IRAQIS SUPPORT U.S. OCCUPATION: An opinion poll found only seven percent of Iraqis now viewed U.S. troops as "liberators," compared to 45 percent six months ago.  The poll was conducted by the Iraq Center for Research and Strategic Studies in April, before pictures of soldiers abusing prisoners drove another wedge between Americans and Iraqis.  Washington said U.N. envoy Lakhdar Brahimi, who has helped to shape handover plans, was expected to announce the names within two weeks of the new Iraqi interim government's leaders.  "We're moving forward," said White House spokesman Scott McClellan. "The people (Brahimi) puts forward, we believe, will be good representatives of an interim government until such time the Iraqis can hold free, fair and open elections."  Heavy exchanges of gunfire occurred in Iraq's southern Shi'ite holy city of Najaf between U.S. forces and militiamen loyal to rebel cleric Moqtada al-Sadr, witnesses said. U.S.-led forces have been battling for weeks to put down a rebellion by Sadr's militia and his supporters. -Alaister MacDonald.