WASHINGTON - US President Barack Obama strongly condemned the killing of UN employees in an attack in northern Afghanistan on Friday, offering condolences to the families and urging the parties to resolve their differences through dialogue."I condemn in the strongest possible terms the attack on the United Nations Assistance Mission in Afghanistan today," Obama said in a statement. "Their work is essential to building a stronger Afghanistan for the benefit of all its citizens. We stress the importance of calm and urge all parties to reject violence."
