US-operated drones kill 708 civilians in 44 Predator attacks targeting Pakistan’s tribal areas between January 1 and December 31, 2009, according to statistics compiled by Pakistani authorities. Dawn reports that for each key al-Qaeda and Taliban militant killed by US drones, 140 Pakistani civilians also die. On average, 58 civilians are reportedly killed in drone attacks every month—about two people per day. [Dawn (Karachi), 1/2/2010] Other estimates of civilian-to-militant deaths over a longer time span vary greatly. Daniel L. Byman of the Brookings Institution, citing analysis by journalist Peter Bergen and Pakistani terrorism expert Amir Mir, estimates that since 2004, drones may have killed 10 civilians for every militant killed in Pakistan. [New Republic, 6/3/2009; Brookings, 7/14/2009] Counter-insurgency expert David Kilcullen cites even more alarming statistics, acknowledging earlier Pakistani estimates that 98 civilians are killed for every two targeted individuals. [Australian Broadcasting Corporation, 1/6/2009; New York Times, 5/16/2009] Bergen and Katherine Tiedmann will later report that new analyses of drone strike deaths in Pakistan from 2004 to March 2010 indicate that the civilian fatality rate is only 32 percent. Their study estimates that of the 114 reported drone strikes in northwest Pakistan from 2004 to the early months of 2010, between 834 and 1,216 people are killed, of whom around 549 to 849 are described as militants in press accounts. [Bergen and Tiedemann, 2/24/2010 ] Apart from the statistics, the controversial weapons are regarded by human rights and legal experts as legally-dubious instruments of extrajudicial killing. [CBS News, 7/21/2009]