Afghan officials say suicide attackers have caused an explosion at the headquarters of the national intelligence service in Kabul.
Officials told reporters that a car loaded with explosives pulled up outside the gate of the National Directorate of Security and detonated, causing a sizable blast that sent a plume of smoke into the air. Witnesses said they heard a volley of gunshots afterward.
It was not immediately clear whether there were any casualties in the attack, which took place about noon local time.
The blast comes just days after Afghan President Hamid Karzai returned from a trip to Washington, where he held talks on Afghan security with U.S. President Barack Obama.