This is the original source:
''Press reports suggest that over the last three years drone strikes have killed about 14 terrorist leaders. But, according to Pakistani sources, they have also killed some 700 civilians. This is 50 civilians for every militant killed, a hit rate of 2 percent — hardly “precision.” American officials vehemently dispute these figures, and it is likely that more militants and fewer civilians have been killed than is reported by the press in Pakistan. Nevertheless, every one of these dead noncombatants represents an alienated family, a new desire for revenge, and more recruits for a militant movement that has grown exponentially even as drone strikes have increased.''
- The New York Times, May 16, 2009
http://www.nytimes.com/2009/05/17/opinion/17exum.html?_r=2&