WikiLeaks said it is close to running out of money, a problem the site blamed on Visa and MasterCard, which have prohibited users from donating to the site.

WikiLeaks' cash reserves have fallen from €800,000 ($983,600) in December 2010 to less than €100,000 at the end of June, the site said, adding that its funds would run out "within a few months" unless donations dramatically increase.

In...