Reports of a secret Yahoo program to search through customers’ incoming emails has spurred other tech companies to deny ever receiving a similar request from the U.S. government.

The program, first reported by Reuters, was created last year through a classified U.S. order, and involves Yahoo searching through hundreds of millions of user accounts at the behest of the National Security Agency or the FBI.

Other U.S. tech companies, including Google, Microsoft, Twitter and Facebook, denied doing anything like it. Most also said they would challenge such a request in court.

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