A Nato helicopter based in Afghanistan intruded into Pakistan North Waziristan region on Tuesday, wounding two Pakistani troops, local intelligence officials said.
"It happened early morning," a Pakistani intelligence official in the region, who declined to be identified, told Reuters. "The helicopter hit a Pakistani checkpost on the border in the Datta Khel area."
Another intelligence official said several Pakistani helicopters took off from Miranshah, the main town in North Waziristan, towards the site of the attack. Last week PM Gilani had promised retaliation if Pakistan sovereignty was violated again after May 2 attack in Abbottabad.
North Waziristan is the base of the Haqqani network blamed for the insurgency in eastern Afghanistan. US-led drone aircraft have repeatedly targeted the area over the past year. U.S. officials have accused Pakistan's ISI for protecting Haqqani group.