Islamabad: Most of the terrorists, who were involved in the brutal attack on an army school in the Pakistani city of Peshawar in December last year have either been killed or arrested, the Pakistani army said Thursday.

In one of the worst acts of human savagery ever perpetrated, the Pakistani Taliban slaughtered 150 people, 140 of them being children, in a brazen attack on the Army Public School in Peshawar Dec 16, in retaliation to the army operation against the extremists in North Waziristan.