The Obama administration for more than two years permitted the National Security Agency to continue collecting vast amounts of records detailing the email and internet usage of Americans, according to secret documents obtained by the Guardian.

The documents indicate that under the program, launched in 2001, a federal judge sitting on the secret surveillance panel called the Fisa court would approve a bulk collection order for internet metadata “every 90 days”. A senior administration official confirmed the program, stating that it ended in 2011.

The collection of these records began under the Bush administration’s wide-ranging warrantless surveillance program, collectively known by theNSA codename Stellar Wind.

According to a top-secret draft report by the NSA’s inspector general – published for the first time today by the Guardian – the agency began “collection of bulk internet metadata” involving “communications with at least one communicant outside the United States or for which no communicant was known to be a citizen of the United States”.

Eventually, the NSA gained authority to “analyze communicationsmetadata associated with United States persons and persons believed to be in the United States”, according to a 2007 Justice Department memo, which is marked secret.

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