The United States forcefully condemned fatal clashes at a United Nations compound sheltering civilians in South Sudan and urged authorities to investigate the incident, which witnesses said involved government troops. At least 18 people and more than 70 others were wounded in the violence Wednesday to Thursday at the camp in the town of Malakal, the aid group Doctors Without Borders (MSF) has said. "The United States condemns in the strongest terms the violence at a UN compound in Malakal that led to the killing of internally displaced persons, and the burning and looting of a facility that provides refuge and aid to over 40,000 victims of the conflict in South Sudan," National Security Advisor Susan Rice said in a statement.