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The European Union has called for a clampdown on Bitcoin amid fears that ISIS is using the virtual currency to fund its international operations.

Islamic State supporters are known to use Bitcoin to make anonymous donations to the terror group.

Hackers linked with Anonymous have claimed ISIS has built up a multi-million pound fortune in Bitcoin - a suggestion which is almost impossible to confirm or disprove.

Officials have urged EU chiefs to "strengthen controls of non-banking payment methods such as electronic/anonymous payments and virtual currencies and transfers of gold, precious metals, by pre-paid cards," according to a draft document seen by Reuters.

The terror group has reportedly amassed a £2billion war chest by looting, illegally sellling oil and even harvesting victims' organs .

(Image: Reuters)

But it has also used Bitcoin to raise smaller amount of funds.

In a document published earlier this year, the European Union Institute for Security Studies said zealots used Bitcoin to "transfer money quickly to account runs by ISIS militants whilst minimising risk of detection".

Mirror Online has also seen pages on the dark web inviting " brothers to fund the jihad anonymously " using the virtual money.

This week, hackers linked to Anonymous claimed the Paris attackers owned a Bitcoin walle t worth more than $3million, although this suggestion has been widely debunked.