On Friday morning, the websites of the Dutch National Prosecutors Office and the National police suffered prolonged downtime from another coordinated DDoS attack. The police started an investigation into these attacks as well. These are probably related to the Mastercard and Visa attacks, the Prosecutors Office said in a statement.

Since WikiLeaks started releasing thousands of classified U.S. government diplomatic cables, several companies have decided to cut WikiLeaks off from their services, including PayPal, MasterCard, Visa and the Swiss payment transaction firm PostFinance, where WikiLeaks founder Julian Assange held an account.

In response, a loose affiliation group calling itself Anonymous orchestrated DDoS attacks against those websites, causing downtime for many of them. The group has dubbed that effort "Operation: Payback." Other websites that have been attacked include those of vocal critics of WikiLeaks, including U.S. Senator Joseph Lieberman and former Alaska governor and vice presidential candidate Sarah Palin.