The heads of three U.N. agencies urged the Saudi-led military coalition on Thursday to lift its blockade of Yemen, warning that “untold thousands” would die if it stayed in place. The coalition closed all air, land and sea access to Yemen on Nov. 6 following the interception of a missile fired towards the Saudi capital, saying it had to stem the flow of arms from Iran to its Houthi opponents in the war in Yemen. Yemen already has 7 million people on the brink of famine, but without the reopening of all ports that number could grow by 3.2 million, the heads of the World Food Programme, UNICEF and the World Health Organization said in a joint statement.