BEIRUT: Saudi Arabia on Friday urged its citizens to leave Lebanon immediately as the UN warned of a “humanitarian catastrophe” if Israel’s invasion continued. Israel has moved thousands of troops into southern Lebanon with the aim of occupying the entire area south of the Litani River, about 30 km north of the border. The Kingdom’s Embassy in Beirut said Saudis should leave because of the “repercussions of the current events, and pointed out that a ban on travel to Lebanon had been in place for some years. Since March 2, more than a million Lebanese have been forced to flee their homes.