(CNN) -- A suicide bomber killed at least 12 police officers and wounded five others in southern Afghanistan on Friday, a provincial governor's spokesman said.
The incident occurred at a reserve police officers unit in the Uruzgan provincial capital of Tarinkot. It follows an attack earlier this week in Kabul, when militants struck a compound housing NATO suppliers and killed seven people.
This comes as the NATO-led International Security Assistance Force plans to withdraw all international combat troops by the end of 2014 but to keep a residual force in the country to help train Afghans and carry out counterterrorism operations when needed. The size of that force remains under discussion.