British PM presses Saudi to avert Yemen 'catastrophe'

British Prime Minister Theresa May has implored Saudi leaders to ease a blockade on Yemen to "avert a humanitarian catastrophe", her office said on Thursday, echoing urgent appeals from the United Nations.May met both King Salman and powerful Crown Prince Mohammed bin Salman on a brief visit to Riyadh late on Wednesday, with a worsening crisis in Yemen topping her agenda.