A double suicide bombing carried out by the Taliban at a Foreign Constabulary training center on Friday resulted in the death of at least 80 people in Pakistan. The attack was allegedly in retaliation of the death of al Qaeda leader Osama bin Laden.

Ihsanullah Ihsan, a spokesman for the Tehrik-i-Taliban Pakistan, gave the following statement: “We have carried out the attack to take revenge for Osama’s death and will continue targeting military personnel as they are defending the US.”

Two suicide bombers on motorcycles struck outside the gates of the training center in Shabqadar, according to a report on The Telegraph. It was about 6 in the morning, and young recruits who had just completed their training were, at that time, waiting to board buses in what should have been the start of their leave. The attack has been tagged as the bloodiest this year, killing at least 80 and wounding 140. Most of those who were killed were young recruits.

Foreign Secretary William Hague said: “These attacks were cowardly and indiscriminate, killing many innocent bystanders and targeting those who serve to protect Pakistan… They prove once again that such extremist groups have no regard for the value of human life.”

The tragedy may cause further strains in the relationship between Pakistan and the U.S., in the wake of the raid on the compound in the garrison town of Abbottabad, Pakistan, where bin Laden was found and eventually killed. Pakistan had been subjected to criticism over the fact that bin Laden was able to “hide in plain sight” for five years.