The US government has long maintained, reasonably enough, that a defining tactic of terrorism is to launch a follow-up attack aimed at those who go to the scene of the original attack to rescue the wounded and remove the dead. Yet ... this has become one of the favorite tactics of the very same US government. Attacking rescuers (and arguably worse, bombing funerals of America's drone victims) is now a tactic routinely used by the US in Pakistan. In February, the Bureau of Investigative Journalism documented that "the CIA's drone campaign in Pakistan has killed dozens of civilians who had gone to help rescue victims or were attending funerals." Specifically: "at least 50 civilians were killed in follow-up strikes when they had gone to help victims." The UN special rapporteur on extrajudicial killings ... Christof Heyns, said that if "there have been secondary drone strikes on rescuers who are helping (the injured) after an initial drone attack, those further attacks are a war crime." There is no doubt that there have been. The frequency with which the US uses this tactic is reflected by this December 2011 report ... on the drone killing of 16-year-old Tariq Khan and his 12-year-old cousin Waheed, just days after the older boy attended a meeting to protest US drones: "[Witnesses] did not provide pictures of the missile strike scene. Virtually none exist, since drones often target people who show up at the scene."