EU interior and justice ministers will gather in Brussels on Friday for a crisis meeting called after the Paris carnage of last weekend.

They will urge the European Commission, the EU executive arm, to propose measures 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," draft conclusions of the meeting said.

Bitcoin is the most common virtual currency and is used as a vehicle for moving money around the world quickly and anonymously via the web without the need for third-party verification.

Electronic anonymous payments can be made also with pre-paid debit cards purchased in stores as gift cards.