U.S. officials have blamed Iran for stream of DDoS attacks against major banks. Security experts say the attacks over the past few months appear to be very well planned and that the attackers have much knowledge of the weak spots in financial services networks, which could make them state sponsored. The ongoing attacks have reportedly prompted some banks to seek the help of the National Security Agency (NSA) A group calling itself “Izz ad-Din al-Qassam Cyber Fighters” has claimed responsibility for a series of attacks.”]