A NATO air strike on an army checkpoint in northwest Pakistan has killed up to 25 soldiers, according to the country's military officials. Islamabad has now blocked the alliance's vital supply lines into Afghanistan in response. The incident threatens to put more pressure on relations between Pakistan and the military alliance, already strained by continued U.S. drone attacks. Ahmed Quraishi, President of Pakistan's biggest lobbying group - the PakNationalists forum, thinks this accident was a deliberate act of punishment.
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