A United Nations investigator has called on the US to make public its data about drone strikes and civilian casualties.
Ben Emmerson has spent the year traveling to countries where the strikes have taken place, and speaking to US officials.
The Obama administration's policy of using drones in places such as Pakistan, Afghanistan and Yemen - chiefly to carry out deadly missile attacks - has come under increasing criticism.
http://www.bbc.co.uk/news/world-us-canada-24583909