(USA Today) Officials for the moment say they cannot pinpoint anything malicious about the extraordinary outage of the Nasdaq stock exchange earlier today.

But the incident had all the earmarks of the three waves of denial-of-service attacks that have bedeviled U.S. financial institutions, including stock brokerages, since last September.

An Iranian hacking collective — Cyber Fighters of Izz ad-Din al-Qassam — has claimed credit for orchestrating sophisticated attacks that have overwhelmed the expensive security systems U.S. banks have put into place to keep their online banking services up and secure.

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