The Defence Secretary has defended the use of unmanned aircrafts as the UK's drone nerve centre was revealed for the first time.
For the first time US politicians heard from civilian victims of their controversial drone attack programme in north-west Pakistan.
US accused of carrying out 'war crimes' in Yemen and Pakistan in major drone report
Amnesty International has accused the US government of unlawfully killing civilians in its drone campaign in the tribal regions of north-west Pakistan.
The rights group also said the US was launching so-called "rescue attacks" in which those who attempted to help victims of the first unlawful killing were injured in a second lethal strike.
In a film produced to coincide with their major study of the impact of drone attacks on local populations in Northern Waziristan, the family of a woman who is said to have died in an attack describe their grief and trauma from the method of her death.
Obama has pledged to reduce the number of drone strikes used, and in May this year switched responsibility for launching a drone attack from the CIA to the Department of Defence.
Amnesty International has called on the US government to "come clean" about the number of unmanned aircraft or drone attacks they are carrying out in north-west Pakistan.
In a scathing report that accuses the US of unlawful killing of civilians that could amount to war crimes, Amnesty said many civilians are being caught in the cross fire of an increasingly dangerous armed conflict waged between US drones, armed al-Qaeda linked groups and the Pakistani army.
The secrecy surrounding the nature as well as the number of attacks taking place means that victims are left without the possibly of compensation, and Pakistani authorities have been accused of neglecting the human rights of residents across the tribal regions, leading to ever-greater instability.
The US has been accused of carrying out unlawful attacks on civilians that could amount to war crimes in Pakistan and Yemen, two scathing reports into the use of drones revealed today.
Amnesty International reviewed 45 known drone strikes that took place in North Waziristan in northwest Pakistan between January 2012 and August 2013 found evidence that a number of civilians, including an elderly woman, and a group of young labourers, were killed in attacks.
Human Rights Watch said their evaluations of six US drone strikes in Yemen found that two of the attacks killed civilians indiscriminately "in clear violations of the laws of war" and the others may have targeted people who were not legitimate targets, or caused disproportionate civilian deaths.
Both reports are based on interviews with dozens people living in areas targeted by US drones.
Amnesty International and Human Rights Watch are jointly calling on the US Congress to investigate the cases documented by their researchers, and disclosed any evidence of human rights violations or war crimes, and prosecute those responsible.
The percentage of missions in which British drones in Afghanistan have used weapons doubled between 2008 and 2012, data released by the Ministry of Defence showed.
In 2008, there were 296 missions over Afghanistan and one or more missiles was deployed by a British-operated Reaper drone on 14 missions, 5 per cent of the total number of sorties.
But in 2012, there were 892 missions by British drones, with weapons being fired on 92 occasions - more than 10 per cent of all sorties.
An RAF spokesman said the drones have "played a vital role supporting military operations in Afghanistan and saving countless UK and allied forces' lives."
He added that the "number of Reaper sorties and associated weapons releases has risen as the number of UK Reaper assets and sorties has increased."
US Secretary of State John Kerry has arrived in Islamabad for talks with the Pakistan government to try to ease tensions over drone strikes near the Afghanistan border, the Associated Press is reporting.
US President Obama has outlined plans to limit the use of US drones, saying they must be targeted against terrorists when a threat was "imminent." Responsibility for launching a drone has been transferred from the CIA to the US Department of Defence. He said:
"To say a military tactic is legal, or even effective, is not to say it is wise or moral in every instance.
"Any drone strike will only be launched when a terrorism suspect cannot be captured. The United States will respect state sovereignty and will limit strikes to al Qaeda or associated targets.
"And before any strike is taken, there must be near-certainty that no civilians will be killed or injured - the highest standard we can set."
Anti-war campaigners have today been protesting against the use of drones outside RAF Waddington, Lincolnshire.
ITV News' Carl Dinnen reports:
An RAF has been targeted today by anti-war protesters following the confirmation that it had begun to remotely control armed drones in Afghanistan.
It's the first time the drones have been controlled from the UK at RAF Waddington in Lincolnshire but the Ministry of Defence say they will not be used for targeted assassinations - a practice that has produced outrage against the American use of drones.
Political Correspondent Carl Dinnen reports:
Chris Nineham, from the Stop the War Coalition, believes armed drones are fundamentally wrong, and he will campaign until the technology is banned.