The United States is expecting a terrorist attack orchestrated by the Saudi extremist Osama bin Laden soon, and has placed its forces in the Middle East on the highest level of alert. State Department officials said intelligence services hadintercepted a coded message toone of bin Laden's senior operatives outlining plans for theattack. The suspected target was in either Saudi Arabia or Kuwait, the officials said. They described the intelligence as highly credible and instantly issued the warning through military and diplomatic channels. The State Department has had all its embassies on a heightened level of alert since late May, when...