The United Nations representative in Yemen has said that the Saudi - led coalition is bombing “effectively, trapped civilians”.Civilians in the northern city of Saada are struggling to flee Saudi - led coalition air strikes targeting Houthi rebels, reports and aid workers say. The UN also warned that the indiscriminate bombing of populated areas is against international law. Air strikes have killed at least 1,400, more than half civilians, the UN says. Air strikes also targeted the home of former President Ali Abdullah Saleh in the capital, Sanaa, early on Sunday. The former president is said to be unharmed.See Also:Saudi Arabia’s Game of Thrones in Yemen Mr Saleh is allied with the Houthi rebels – who overran Sanaa from their base in north Yemen last year and now control much of the country. The UN humanitarian co-ordinator for Yemen, Johannes Van Der Klauuw, said he was “deeply concerned” by the impact of the latest strikes on the north. “Many civilians are effectively trapped in Saada” because of fuel shortages, he said. The Saudi-led coalition says it regards Saada a “military zone”. On Friday it dropped leaflets warning residents to leave. Mr Van Der Klauuw said that the decision to target the entire province “will put countless civilians at risk”.