The National Security Agency’s Web site went down for several hours, but the US spy service known for hacking into computer networks blamed the outage on a technical mistake.

The Website, NSA.gov, went down yesterday in the afternoon, setting off speculation on Twitter that the site may have suffered a denial of service attack by hackers.

But an NSA spokesperson denied the claims, saying they were “not true.”

“NSA.gov was not accessible for several hours tonight because of an internal error that occurred during a scheduled update. The issue will be resolved this evening,” the spokesperson added.

“Claims that the outage was caused by a distributed denial of service attack are not true.”

The Web site was operational again around 10:30 pm (local time).

The hacker group Anonymous joked about the incident in a tweet, without saying if it had played any role. “Aw don’t panic about nsa.gov being down. They have a back-up copy of the Internet,” it said.

The loosely organised, international hacker collective has frequently clashed with US authorities over file-sharing as well as allowing banks to handle donations to the anti-secrecy group WikiLeaks.

The NSA has been at the centre of a furore over its vast electronic surveillance operations, revealed in a series of leaks from former intelligence contractor Edward Snowden, who has obtained asylum in Russia.

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