Avalanche: Online crime network hit in global operation

One of the world's biggest networks of hijacked computers has been dismantled after a four-year investigation, the EU law enforcement agency Europol says. The Avalanche network was used to target online bank customers with phishing and spam emails, it adds. More than a million emails were sent per week with malicious files or links. When users opened them, their infected computers became part of the network. Five people have been arrested, but Europol has not said where.