<sod >It was the first known incident of the group using an unmanned aerial vehicle â previously utilised for surveillance and propaganda videos â as weapon, but a discovery made by researchers in a former Isis stronghold suggests the attack could be part of a wider programme.< eod>< sod > It was the first known incident of the group successfully using an unmanned aerial vehicle â previously utilised for surveillance and propaganda videos â as weapon, but a discovery made by researchers in a former Isis stronghold suggests the attack could be part of a wider programme.< eod>