The Pakistanis, the military official said, had meanwhile withheld information about the location of its border posts.

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In Germany, the Bavarians have reluctantly removed border posts with Austria, only to reinstate police controls further inland.

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Over the past year, Pakistani Taliban fighters have used Afghanistan as staging grounds for attacks on Pakistani border posts.

WSJ: Role Reversal: Pakistan Fears

Afghanistan believes that Pakistan is taking advantage of the reduction in US forces, seizing ground and setting up new border posts, he adds.

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The Polish border with Belarus is not just marked by shiny new border posts, but also places like the beautiful, dense and extensive Bialowieska Forest.

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Pakistan says it has increased the number of soldiers at border posts like these as part of a campaign in Mohmand this year to wipe out the Taliban in the area.

WSJ: Airstrike Ravages U.S.-Pakistan Ties

Egyptian authorities said the guards who were manning the Palestinian side of the border had abandoned their posts.

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Several times its troops have sealed the border with Kosovo, trapping refugees between frontier posts.

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She agreed with LBG's assessment that about 1, 000 posts would be affected north of the border.

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As U.S. military, Pakistani forces and Afghan officials sought to piece together the incident, Afghan, U.S. and Western officials said the attack took place in response to fire from the remote Pakistani posts in the Mohmand tribal region, a lawless border area that abuts Afghanistan's eastern Kunar province.

WSJ: Airstrike Ravages U.S.-Pakistan Ties