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 and the lifting of a moratorium on executions.

Earlier this week, Army Chief General Raheel Sharif signed death warrants for the four militants who were named as Maulvi Abdus Salam, Hazrat Ali, Mujeebur Rehman and Sabeel.

Security officials said the four men were executed early on Wednesday at a jail in the north-western city of Kohat.