At least 2,464 people have now been killed by US drone strikes outside the country’s declared war zones since President Barack Obama’s inauguration six years ago, the Bureau’s latest monthly report reveals.

Of the total killed since Obama took his oath of office on January 20 2009, at least 314 have been civilians, while the number of confirmed strikes under his administration now stands at 456.

Research by the Bureau also shows there have now been nearly nine times more strikes under Obama in Pakistan, Yemen and Somalia than there were under his predecessor, George W Bush.

And the covert Obama strikes, the first of which hit Pakistan just three days after his inauguration, have killed almost six times more people and twice as many civilians than those ordered in the Bush years, the data shows.

The figures have been compiled as part of the Bureau’s monthly report into covert US drone attacks, which are run in two separate missions – one by the CIA and one for the Pentagon by its secretive special forces outfit, Joint Special Operations Command (JSOC).

The research centres on countries outside the US’s declared war zones of Iraq and Afghanistan.

The first strike of the Bush administration, outside Afghanistan, was on November 3 2002, in Yemen. However there was not a reported drone strike outside Iraq or Afghanistan for 18 months, until the CIA killed 6-8 in Pakistan on June 17 2004. That was more than three years into President Bush’s first term.

In total, there were 52 strikes under Bush, killing 416 people, of whom 167 were civilians.

According to the Bureau’s latest report, January 2015 saw an intensification of the US campaign in both Pakistan and Yemen.