A series of occasional armed skirmishes and firefights have occurred along the Afghanistan–Pakistan border between the Afghan National Security Forces and the Pakistan Armed Forces since 1949. The latest round of hostilities between the two countries began in April 2007. Militants belonging to Tehrik-i-Taliban Pakistan and Jamaat-ul-Ahrar also use Afghanistan's territory to target Pakistani security personnel deployed along the border. The Diplomat says that the presence of terrorists belonging to Tehrik-i-Taliban Pakistan on Afghan soil is the reason for sporadic shelling of Afghanistan's territory by Pakistani security forces.