Pakistani troops have fired shots into the air to stop US troops crossing into the South Waziristan region of Pakistan, local officials say.
Reports say seven US helicopters landed on the Afghan side of the border and US troops then tried to cross the border.
South Waziristan is one of the main areas from which Islamist militants launch attacks into Afghanistan.
The incident comes amid growing anger in Pakistan over US attacks along the border region.
The confrontation began at around midnight, local officials say.
As the US troops tried to cross the border from the Afghan province of Paktika, Pakistani paramilitary soldiers at a checkpoint Pakistanis 'kill 100 militants' ...
President Bush gave orders for cross-border assaults in Pakistan ... opened fire into the air and the US troops decided not to continue forward.
Reports say the firing lasted for several hours. Local people evacuated their homes.
The incident happened close to the town of Angoorada.
(BBC)
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