BBC News with Michael Powles

The United States has authorized the departure of government dependents from Mexican border cities, following fatal attacks by suspected drug traffickers on consular staff. In two separate incidents, one official from the US consulate in Ciudad Juárez was killed along with two others connected with the mission. Madeleine Morris reports from Washington.

An American female consulate employee, her husband and infant daughter were returning from a party on Saturday when their car came under gunfire in Juarez. Both adults were killed; the child survived. In a separate attack, the Mexican husband and two children of another consulate employee were also shot at after leaving the same party. He was killed and the two children suffered injuries. President Barack Obama has expressed outrage of what he called "the brutal murders", and he's vowed to help bring the killers to justice.

United Nations Secretary General Ban Ki-moon is in Haiti to inspect what has been described as the most challenging emergency his organization has ever dealt with. Two months after the earthquake that hit the island, hundreds of thousands of people, possibly more than a million are still without adequate shelter and sanitation. Mark Doyle reports from the Haitian capital Port-au-Prince.

As the secretary-general's executive jet flew in over Port-au-Prince, he would have been able to see the great expanses of tents and tarpaulins that a large proportion of the homeless population here are now living under after their houses collapsed. Aid workers are racing against time to try to get hundreds of thousands of other homeless people into camps before the heavy rainy season begins. The UN secretary-general is due to visit one camp that's been established on a former golf course.