Syrian rebels pose after seizing a border crossing. Photo: Screenshot.

Metro – Documents found on a laptop belonging to an IS fighter showed that the group were searching for the weapons of mass destruction, including samples of the bubonic plague. The news comes as Britain’s threat Level for International Terrorism increased to ‘severe’ yesterday after an increase in Islamic State jihadist activity.

The laptops, found by a moderate Syrian rebel, contained instructions on how to breed the bubonic plague from infected animals and how to use it as a weapon, according to a report in ‘Foreign Policy’ magazine.

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