A new analysis of the data available to the public about drone strikes, conducted by the human-rights group Reprieve, indicates that even when operators target specific individuals the most focused effort of what Barack Obama calls targeted killing they kill vastly more people than their targets, often needing to strike multiple times. Attempts to kill 41 men resulted in the deaths of an estimated 1,147 people, as of 24 November. Reprieve [focused on] cases in which specific people were targeted by drones multiple times. Their data, shared with the Guardian, raises questions about the accuracy of US intelligence. The analysis is a partial estimate. Drone strikes ... are only as precise as the intelligence that feeds them. There is nothing precise about intelligence that results in the deaths of 28 unknown people, including women and children, for every bad guy the US goes after, said Reprieves Jennifer Gibson. The data cohort is only a fraction of those killed by US drones. Neither Reprieve nor the Guardian examined ... the so-called signature strikes that attack people based on a pattern of behavior considered suspicious, rather than intelligence tying their targets to terrorist activity. An analytically conservative Council on Foreign Relations tally assesses that 500 drone strikes outside of Iraq and Afghanistan have killed 3,674 people. Like all weapons, drones will inevitably miss their targets. But the secrecy surrounding them obscures how often misses occur and the reasons for them.