Pakistan has hanged four men linked to last December's massacre at an army school which killed more than 150 people, mostly children. The men were sentenced to death by a military court and are the first to be hanged in relation to the attack. Taliban militants stormed the Army Public School in the north-western city of Peshawar on 16 December 2014. The hangings come just two weeks ahead of the anniversary of the attack, which shocked the nation. The massacre prompted a crackdown on Islamist militants, the establishment of military courts to try terror suspects and the resumption of capital punishment after a six-year moratorium.