The United Nations Assistance Mission in Afghanistan says a car bomb exploded outside its offices in the southern city of Kandahar. The blast reportedly injured one man, who was driving by the scene on a motorcycle.
U.N. officials say the explosion occurred late in the afternoon, damaging part of the U.N. compound.
Afghan police are not commenting on the incident, but have launched an investigation into what was apparently a car bombing.
The city of Kandahar was previously the center of the Taleban movement, Afghanistan's former hard-line religious rulers.
Wednesday is the second anniversary of the Taleban's surrender of the Afghan capital, Kabul, during the 2001 war that led to their ousting.