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PARACHINAR, Pakistan – A NATO helicopter attacked a Pakistani border post near Afghanistan on Thursday, killing three troops, security officials in Pakistan said. Later, government officials said they were ordered to stop trucks carrying supplies for international forces from entering Afghanistan at a major border crossing.

NATO said it was investigating the allegations and whether they were linked to an operation against insurgents in a nearby Afghan province.

The accusations and the fallout are likely to exacerbate tensions between Islamabad and Washington, which is struggling to beat back a resurgent Taliban movement in the 9-year-old Afghan war. Over the weekend, NATO choppers fired on targets in Pakistan, killing several alleged insurgents they had pursued over the border from Afghanistan.