Monday night, the Al Qaeda-linked Ansar Bayt Al Maqdis, which Sunday blew up the South Korean tourist bus, gave all foreign nationals an ultimatum to remove themselves from Sinai by Thursday or stay at their risk. Three North Koreans and the Egyptian bus driver were killed. DEBKAfile: After mortally striking Egypt’s tourist trade, the Islamists are now aiming to get rid of Israeli trippers and the hundreds of American peacekeepers of the US-led Multinational Force.