The European Union has unveiled new measures to curb the financing of extremist groups amid calls for more action following last year's attacks in Paris.

The proposals made public Tuesday aim to track extremists as they move money or assets and limit their ability to raise funds by targeting their sources of income.

The plan would oblige EU financial institutions to carry out compulsory checks on money flows from countries with doubtful records on money-laundering and extremist financing.

It would boost intelligence-sharing among EU finance experts and give them more access to bank and payment data.

Virtual money like bitcoins would come under scrutiny when exchanged for real currencies, and limits would be imposed on anonymous transactions with pre-paid cash cards.