The Obama administration has ordered all non-emergency personnel to leave Yemen and urged U.S. citizens currently living there to “depart immediately.” In a statement issued today, the State Department cited “the continued potential for terrorist attacks.” Meanwhile, a U.S. drone strike killed four people in Yemen today, marking the fourth such attack in less than two weeks. Yemeni tribal leaders said the dead were suspected members of al-Qaeda. One is believed to be a senior al-Qaeda member named Saleh Jouti.