SANAA – The US has ordered all its non-essential diplomats and family members of embassy staff to leave Yemen as fighting there escalates, according to the BBC. Medical sources say 72 people have died in three days of clashes between tribal fighters and government troops. President Ali Abdullah Saleh has again said he will not step down, despite mounting protests. He has so far refused to sign a transition deal that would see him resign in favour of a unity government. The US has repeated its call for Saleh to step down, urging all sides to accept a ceasefire. Fighters from a powerful tribal group, the Hashid, are said to have taken control of several public buildings in the capital Sanaa after several days of fighting government troops.