US drone strikes in Yemen and Pakistan have killed as many as 1,147 unknown people in failed attempts to kill 41 named individuals, a report by human rights charity Reprieve has found.

The report looks at deaths resulting from US drone strikes in Yemen and Pakistan between November 2002 and November 2014. It identifies 41 men who appeared to have been killed multiple times – drawing into question the Obama administration’s repeated claims that the covert drone programme is ‘precise.’

While the US drone programme is shrouded in secrecy, security sources regularly brief the media on the names of those suspected militants targeted or killed in the strikes. Frequently, those individuals are reported to have been targeted or killed on multiple occasions.