This involved a series of hijacked computers that caused servers to become overloaded due to flooding of traffic called a DDoS attack. The number of hijacked computers varies between sources and includes 50,000 from Symantec's Security Technology Response Group, 20,000 from South Korea's National Intelligence Service and more than 166,000 from Vietnamese cybersecurity researchers as they analyzed the two servers used by the invaders. . The Canadian government revealed in news sources that it was the victim of cyberattacks in February 2011 by foreign hackers with Chinese IP addresses. These hackers managed to infiltrate three Canadian government departments and pass on sensitive information to them. Canada eventually cut off the three departments' internet access to stop transmission to China. PayPal was the victim of a cyberattack in December 2010 after it permanently restricted the account used by WikiLeaks to raise funds, citing violations of the Acceptable Use Policy as the reason. However, this not only resulted in multiple boycotts from individual users, but also caused hackers to intervene. The largest protest movement against the Church of Scientology was led by Anonymous,