The U.S. ambassador to Saudi Arabia traveled to this oil-industry city Monday with a message for Americans in the kingdom: Go home. We cannot protect you. Gathered in a meeting room in a Holiday Inn still pocked with bullet holes after the latest attack on Westerners killed six people, including two Americans, many said they would follow his advice. The first to go were some of the 90 foreign employees of ABB Lummus Global Inc. The offices of the Houston-based oil contractor were attacked Saturday by four gunmen apparently trying to encourage Saudis to join the resistance against the U.S. occupation of Iraq. Full Story