US journalist, James Foley, was seized by armed men in Syria in November 2012 and was killed by a man with an apparently British accent. David Cameron condemned the barbaric and brutal murder and confirmed that: “it looks increasingly likely that [the perpetrator] is a British citizen.” He explained that intentions of the British government were “…to arrest and prosecute those who take part in this extremism and violence.” So what are the powers of the English authorities to prosecute a murder committed abroad by a British citizen, and do any such powers extend to foreign accomplices in that murder?