These are only newspaper reports which needs to be "substantiated", Foreign Secretary Ranjan Mathai said.
He was asked about a New York Times report which said that in a secret deal, Pakistan allowed American drone strikes on its soil on the condition that the UAVs would stay away from its nuclear facilities and mountain camps where Kashmiri militants were trained for attacks in India.
"Pakistani intelligence officials insisted that drones fly only in narrow parts of the tribal areas - ensuring that they would not venture where Islamabad did not want the Americans going: Pakistan's nuclear facilities, and the mountain camps where Kashmiri militants were trained for attacks in India," the paper said.