Nato in Afghanistan says its aircraft crossed into Pakistan and fired at suspected militants, in an attack Pakistan says killed three soldiers.
Nato said its aircraft killed “several armed individuals” as the crew believed they were being fired on.
Pakistan says the helicopter attacked a military checkpoint, and that it “strongly disapproves” of violation of its sovereignty.
It has blocked supply routes for US and Nato troops in Afghanistan.
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It is not clear whether the closure is in retaliation for the attack.