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By using open-source data, one investigative journalist believes it is possible to analyse photographs and videos posted by insurgents in the Middle East to find out where they were taken.

Eliot Higgins, co-founder of the website Belling Cat, matches notable features within such videos - including buildings and the surrounding landscape - to other images of the area.

In doing so, he believes to have pinpointed a location in which the beheading of US journalist James Foley was conducted by Islamic State (IS) in August.

麻豆官网首页入口 Click presenter Spencer Kelly meets him.