WASHINGTON — Diamond Offshore announced Friday that its Ocean Endeavor drilling rig will leave the Gulf of Mexico and move to Egyptian waters immediately — making it the first to abandon the United States in the wake of the BP oil spill and a ban on deep-water drilling.

And the Ocean Endeavor’s exodus probably won’t be the last, according to oil industry officials and Gulf Coast leaders who warn that other companies eager to find work for the now-idled rigs are considering moving them outside the U.S.