Visa's decision is a powerful blow to the loosely knit organization, which relies on online donations to fund its operations.
CBSNews.com Special Report: WikiLeaks
Popular online payment company . Visa's decision to pull the plug on WikiLeaks leaves the website with one fewer source of revenue.
Swiss authorities closed Assange's Monday.
Earlier Tuesday, British police said that WikiLeaks founder Julian Assange seeking his detention for questioning in a sex-crimes investigation, but the man who has angered Washington by spilling thousands of government secrets on the Internet has vowed in Court to fight extradition.
Assange was arrested at 9:30 a.m. (0430 EDT) Tuesday and is currently appearing before Westminster Magistrate's Court. He surrendered Tuesday under an agreement reached between his own lawyers and the police.
Assange told a judge that he will fight extradition, reports the Associated Press.
CBS News correspondent Elizabeth Palmer reports Tuesday's court hearing will be for British law officials to decide whether Assange should be extradited to Sweden to face the allegations. His legal team have already vowed to fight the extradition request, but Assange's arrest will be just the first step in a long, complicated legal battle.
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