The Swiss post office's bank, PostFinance, has shut the accounts of Wikileaks founder Julian Assange.
The whistle-blowing website says the move affects a defence fund and personal assets worth 31,000 euros.
Wikileaks has published hundreds of secret US diplomatic cables, angering the US government and triggering moves by several companies including PayPal and Amazon to end their services.
Meanwhile, a warrant for Mr Assange's arrest has reached the UK authorities.
Sources have told the BBC that the European Arrest Warrant for Mr Assange arrived on Monday afternoon.
Swedish prosecutors want to question Mr Assange, external in connection with allegations of rape, sexual molestation and unlawful coercion, which he denies.
He is believed to be in hiding somewhere in south-east England. Once the police have located him, he would be expected to appear at a magistrate's court within 24 hours, pending extradition to Sweden, says the BBC's security correspondent Frank Gardner.
Mr Assange's UK lawyer, Mark Stephens, told the BBC: "We are in the process of making arrangements to meet with the police by consent in order to facilitate the taking of the question and answer that is needed."