Israel's justifications for its assault on Gaza have shifted more than once since Operation 'Brother's Keeper' was launched on 12 June, supposedly in response to the kidnapping of three Israeli teenagers. The rockets 'raining down terror' on Israel (they have so far killed three people, giving them a kill rate of 0.1 per cent) were the reason given for the launch of operation 'Protective Edge' on 8 July; the ground invasion of Gaza on 17 July was said to be aimed at destroying a series of tunnels leading into Israel.