The four gunmen who attacked a university in northwest Pakistan were trained in Afghanistan, according to the Pakistani army, NBC News reported.
On Wednesday, the four militants stormed Bacha Khan University in Charsadda, killing 20 people.
General Asim Bajwa told reporters the militants crossed over into Pakistan from the Torkham border between the two countries. He said the siege was masterminded by Umar Mansoor, a Pakistani Taliban militant based in Afghanistan.
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Video footage of the fighters was released by Mansoor on Friday. He also vowed more attacks on schools in the future.
Mansoor is also behind the Dec. 24 massacre of 134 children in Peshawar — the deadliest militant attack in Pakistan’s history.