US drone strike killings in Pakistan and Yemen 'unlawful'
22 October 2013 Last updated at 07:48 BST
CIA drone attacks in Pakistan are responsible for unlawful killings, some of which could amount to war crimes, Amnesty International says.
Amnesty said it reviewed nine recent drone strikes in North Waziristan and found a number of victims were unarmed.
However, President Obama has insisted that without the drones, the US would have had to resort to "more intrusive military action"
Rajini Vaidyanathan reports.