The Pentagon insisted the Department of Defense was only seeking to restrict access to certain content. Photograph: Rick Wilking/Reuters

Military admits to filtering reports and content relating to government surveillance programs for thousands of personnel.

The US army has admitted to blocking access to parts of the Guardian website for thousands of defence personnel across the country.

A spokesman said the military was filtering out reports and content relating to government surveillance programs to preserve “network hygiene” and prevent any classified material appearing on unclassified parts of its computer systems.

The confirmation follows reports in the Monterey Herald that staff at the Presidio military base south of San Francisco had complained of not being able to access the Guardian’s UK site at all, and had only partial access to the US site, following publication of leaks from whistleblower Edward Snowden.

The Pentagon insisted the Department of Defense was not seeking to block the whole website, merely taking steps to restrict access to certain content.

But a spokesman for the Army’s Network Enterprise Technology Command (Netcom) in Arizona confirmed that this was a widespread policy, likely to be affecting hundreds of defence facilities.

“In response to your question about access to the guardian.co.uk website, the army is filtering some access to press coverage and online content about the NSA leaks,” said Gordon Van Vleet, a Netcom public affairs officer.

“The Department of Defense routinely takes preventative ‘network hygiene’ measures to mitigate unauthorized disclosures of classified information onto DoD unclassified networks.”

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