A suspect was arrested for allegedly taking part in Wednesday's online attacks against MasterCard Inc., Visa Inc. and PayPal Inc.
Visa and MasterCard may also be facing a lawsuit for trying to cut ties with WikiLeaks after it exposed a large number of classified government documents.
Dutch prosecutors said they have arrested a 16-year-old boy suspected of being involved in the cyber attacks against the payment networks. On Wednesday a series of online attacks slowed or prevented access to the websites of MasterCard, Visa and eBay Inc.'s PayPal.
One effect of the attacks was a temporary outage of SecureCode, a MasterCard payment-verification system.
Separately, the Icelandic payment processor DataCell, which handled payments for WikiLeaks, said it is considering taking "immediate legal actions to make donations possible again" for WikiLeaks.
Andreas Fink, DataCell's chief executive, said on its website that "the suspension of payments toward WikiLeaks is a violation of the agreements" the payments brands had "with their customers."