A Nato helicopter incursion into North Waziristan wounded two troops on Tuesday, local intelligence officials said, further ratcheting up tensions between Islamabad and the West, Pakistan\'s Geo TV reported. \"It happened early morning,\" a Pakistani intelligence official in the region, who declined to be identified, said. \"The helicopter hit a Pakistani check post 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 for rescue purposes. A spokesman for Western forces in Afghanistan said the coalition was not unaware of any incident, but would investigate.