The National Security Agency is currently collecting the telephone records of millions of US customers of Verizon, one of America’s largest telecoms providers, under a top secret court order issued in April.

The order, a copy of which has been obtained by the Guardian, requires Verizon on an “ongoing, daily basis” to give the NSA information on all telephone calls in its systems, both within the US and between the US and other countries.

The document shows for the first time that under the Obama administration the communication records of millions of US citizens are being collected indiscriminately and in bulk – regardless of whether they are suspected of any wrongdoing.

The secret Foreign Intelligence Surveillance Court (Fisa) granted the order to the FBI on April 25, giving the government unlimited authority to obtain the data for a specified three-month period ending on July 19.

Under the terms of the blanket order, the numbers of both parties on a call are handed over, as is location data, call duration, unique identifiers, and the time and duration of all calls. The contents of the conversation itself are not covered.

The disclosure is likely to reignite longstanding debates in the US over the proper extent of the government’s domestic spying powers.,,

The court order expressly bars Verizon from disclosing to the public either the existence of the FBI’s request for its customers’ records, or the court order itself.

It is not known whether Verizon is the only cell-phone provider to be targeted with such an order, although previous reporting has suggested the NSA has collected cell records from all major mobile networks. It is also unclear from the leaked document whether the three-month order was a one-off, or the latest in a series of similar orders.

The terms of the order aren’t new. Banks and banking records are subject to the same regulations. Still – the checks and balances chartered with protecting citizens’ rights continue under assault by a so-called wartime footing.