ProPublica and The New York Times published a report Sunday that sheds new light on the vast reach of the National Security Agency's Internet surveillance efforts following the Sept. 11, 2001, terror attack on the United States -- and on the apparently enthusiastic cooperation of telecom giant AT&T in the intelligence effort.

The Times headlines the report, based on information mined from the trove of documents released by former NSA contractor Edward Snowden, "AT&T Helped U.S. Spy on Internet on a Vast Scale." ProPublica's apparently identical story, published online, carries the headline "NSA Spying Relies on AT&T's 'Extreme Willingness to Help.'"

Although the NSA documents do not identify AT&T or another prominent cooperator, Verizon, by name, the news organizations said they found a wealth of evidence that linked the companies to NSA spying programs. The report says the companies' identities were confirmed by unnamed former intelligence officials.

The story also says that AT&T has apparently handed over data from other Internet service providers and telecoms that use its networks.

Here's how the report summarizes how the companies' cooperation fits into the NSA's surveillance efforts:

The companies’ sorting of data has allowed the N.S.A. to bring different surveillance powers to bear. Targeting someone on American soil requires a court order under the Foreign Intelligence Surveillance Act. When a foreigner abroad is communicating with an American, that law permits the government to target that foreigner without a warrant. When foreigners are messaging other foreigners, that law does not apply and the government can collect such emails in bulk without targeting anyone.

AT&T’s provision of foreign-to-foreign traffic has been particularly important to the N.S.A. because large amounts of the world’s Internet communications travel across American cables. AT&T provided access to the contents of transiting email traffic for years before Verizon began doing so in March 2013, the documents show. They say AT&T gave the N.S.A. access to “massive amounts of data,” and by 2013 the program was processing 60 million foreign-to-foreign emails a day.

Because domestic wiretapping laws do not cover foreign-to-foreign emails, the companies have provided them voluntarily, not in response to court orders, intelligence officials said. But it is not clear whether that remains the case after the post-Snowden upheavals.

“We do not voluntarily provide information to any investigating authorities other than if a person’s life is in danger and time is of the essence,” Brad Burns, an AT&T spokesman, said. He declined to elaborate.

Here's the Associated Press distillation of the Times/ProPublica report:

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WASHINGTON — Under a decades-old program with the government, telecom giant AT&T in 2003 led the way on a new collection capability that the National Security Agency said amounted to a "'live' presence on the global net" and would forward 400 billion Internet metadata records in one of its first months of operation, The New York Times reported.

The Fairview program was forwarding more than 1 million emails a day to the NSA's headquarters in Fort Meade, Maryland, the newspaper reported. Meanwhile, the separate Stormbrew program, linked to Verizon and the former company MCI, was still gearing up to use the new technology, which appeared to process foreign-to-foreign traffic.

In 2011, AT&T began handing over 1.1 billion domestic cellphone calling records a day to the NSA after "a push to get this flow operational prior to the 10th anniversary of 9/11," according to an internal agency newsletter cited by the Times. Intelligence officials have told reporters in the past that, for technical reasons, the effort consisted mostly of landline phone records, the newspaper reported.

The NSA spent $188.9 million on the Fairview program, twice the amount spent on Stormbrew, its second-largest corporate program, the newspaper reported.

Such details from the decades-long partnership between the government and AT&T emerged from NSA documents provided by former NSA systems analyst Edward Snowden, the Times reported in a story posted Saturday on its website. The Times and ProPublica jointly reviewed the documents, which date from 2003 to 2013.

While it has been long known that American telecommunications companies worked closely with the spy agency, the newspaper reported, the documents show that the government's relationship with AT&T has been considered unique and especially productive. One document described it as "highly collaborative," while another lauded the company's "extreme willingness to help," the newspaper reported.

The documents show that AT&T's cooperation has involved a broad range of classified activities, according to the Times. AT&T has given the NSA access, through several methods covered under different legal rules, to billions of emails as they have flowed across its domestic networks.

It also has provided technical assistance in carrying out a secret court order permitting the wiretapping of all Internet communications at U.N. headquarters, a customer of AT&T, the Times reported. While NSA spying on U.N. diplomats had been previously reported, the newspaper said Saturday that neither the court order nor AT&T's involvement had been disclosed.

The documents also reveal that AT&T installed surveillance equipment in at least 17 of its Internet hubs on American soil, the Times reported, far more than similarly sized competitor Verizon. AT&T engineers were the first to try out new surveillance technologies invented by the NSA, the newspaper reported.

The NSA, AT&T and Verizon declined to discuss the findings from the files, according to the Times. It is not clear if the programs still operate in the same way today, the newspaper reported.

One of the documents provided by Snowden reminds NSA officials to be polite when visiting AT&T facilities, the Times reported, and notes, "This is a partnership, not a contractual relationship."

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