But Noor Behram says his painstaking work has uncovered an important – and unreported – truth about the US drone campaign in Pakistan's tribal region: that far more civilians are being injured or dying than the Americans and Pakistanis admit. The world's media quickly reports on how many militants were killed in each strike. But reporters don't go to the spot, relying on unnamed Pakistani intelligence officials.

Noor Behram believes you have to go to the spot to figure out whether those killed were really extremists or ordinary people living in Waziristan. And he's in no doubt. "For every 10 to 15 people killed, maybe they get one militant," he said. "I don't go to count how many Taliban are killed. I go to count how many children, women, innocent people, are killed."

The drone strikes are a secret programme run by the CIA to assassinate al-Qaida and Taliban extremists using remote, wild Waziristan as a refuge. The CIA does not comment on drones, but privately claims civilian casualties are rare.