Pakistan faced Taliban insurgent violence that largely began in 2008 during the rule of General Pervez Musharraf. The outlawed terrorist organisation Tehrik-i-Taliban has claimed responsibility for past attacks on some Chinese nationals, and Chinese commentators have raised concerns that the safety of construction workers could be under threat. China reportedly also expressed concern that militant groups in Xinjiang could collaborate with Tehrik-i-Taliban militants in Pakistan. In 2014, Pakistan launched Operation Zarb-e-Azb to eradicate Tehrik-i-Taliban militants from Pakistani territory, following an attack on Karachi's airport, and the 2014 Peshawar school massacre in which terrorists from Tehrik-i-Taliban killed 148 school children.