"Up to 30,000 foreign fighters from as many as 100 countries have travelled to Syria and Iraq since 2011, according to an independent analysis. Half came from neighbouring countries and north Africa, and a quarter from Europe and Turkey, says the Global Terrorism Index, drawn up by the Institute for Economics and Peace (IEP) thinktank. The flow of foreign fighters does not appear to be diminishing, with more than 7,000 arriving in the first six months of 2015."