The Department of Homeland Security is investigating the US Internal crackers on the attack that led to the collapse, among others, the PlayStation Network in the evening venerdì.SecondoDyn, a company that deals with the detection and monitoring of the performance of the Internet, the attack came from "tens of millions of IP addresses at the same time" .Dyn believes that there is not a nation behind these attacks, carried out, for experts, through a malware distributed to printers connected to the DVR and rete.Ad each attack also those responsible "are moving around the world" to minimize the risk of being driven out.Release Date: Service available from March 23, 2007