But the "legal gray zone" itself is alarming enough—highlighting the lack of transparency surrounding the administration's drone program—as are the discrepancies in total numbers killed. It's between 2,537 and 3,581 (including 411 to 884 civilians) killed since 2004, if you want to go with the BIJ. Or it's between 1,965 and 3,295 people since 2004 (and 261 to 305 civilians), if you want to believe the Counterterrorism Strategy Initiative at the New America Foundation. Or perhaps it's 2,651 since 2006 (including 153 civilians), according to Long War Journal. (The NAF and Long War Journal base estimates on press reports. BIJ also includes deaths reported to the US or Pakistani governments, military and intelligence officials, and other academic sources.)