As the drone circled it let off the first of its Hellfire missiles, slamming into a small house and reducing it to rubble. When residents rushed to the scene of the attack to see if they could help they were struck again.
According to reports at the time, three local rescuers were killed by a second missile whilst a further strike killed another three people five minutes later. In all, somewhere between 17 and 24 people are thought to have been killed in the attack.
The Datta Khel assault was just one of the more than 345 strikes that have hit Pakistan's tribal areas in the past eight years but it reveals an increasingly common tactic now being used in America's covert drone wars – the "double-tap" strike.
More and more, while the overall frequency of strikes has fallen since a Nato attack in 2011 killed 24 Pakistani soldiers and strained US-Pakistan relations, initial strikes are now followed up by further missiles in a tactic which lawyers and campaigners say is killing an even greater number of civilians. The tactic has cast such a shadow of fear over strike zones that rescuers often wait for hours before daring to visit the scene of an attack.
