In August, Allen estimated about a quarter of the attacks are being carried out by infiltrators from the Taliban, the Islamic militia that ruled most of Afghanistan before the U.S.-led invasion in 2001.
MORE: http://www.cnn.com/2012/09/17/world/meast/us-afghanistan-attacks/index.html
See also...
Suicide attacks kill 13 in Afghanistan
http://www.cnn.com/2012/09/18/world/asia/afghanistan-attack/index.html
