December 2, 2015 4:03 AM EST

Pakistani authorities on Wednesday executed four men involved in last year’s massacre at a school in the country’s northern city Peshawar, in which more than 150 people, mostly children, were gunned down by terrorists.

They are the first people to be hanged in connection with the horrific Dec. 16, 2014, attack, the BBC reported.

The Pakistani Taliban claimed responsibility for the attack that shook the nation to its core, and the four men hanged Wednesday are among a group of six militants sentenced to death by a military court.

[BBC]

Read next: School Massacre Unites Pakistan Against the Taliban

Write to Rishi Iyengar at rishi.iyengar@timeasia.com.

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