(CNN) -- A suicide car bomber rammed a minibus filled with Afghan National Army soldiers south of Kabul Wednesday, killing 13 people, including six soldiers, said military spokesman Gen. Mohammed Zahir Azimi.
The attack, which took place around 6:50 a.m. in the Chihulsutoon area, came about 24 hours after another suicide car bomber attacked a NATO International Security Assistance Force convoy in Kabul, wounding at least 22 civilians.
There were no military casualties in that attack, according to NATO.
In other violence Tuesday, a NATO service member was killed and two others wounded when an explosion struck a patrol in southern Afghanistan, according to a statement from NATO's International Security Assistance Force.
The name and nationality of the dead soldier was being held, and the wounded personnel's injuries were not considered to be life threatening, the statement said.
The attacks coincide with the visit of U.S. Defense Secretary Robert Gates, who was meeting with military commanders, his Afghan counterpart, Abdul Rahim Wardak, and Afghan President Hamid Karzai.
He arrived Monday for his third visit to the war-torn nation since being confirmed as Pentagon chief. Watch as Gates visits Khost province, near the Pakistan border » E-mail to a friend