PhotoOn the heels of news that millions of Yahoo user accounts had been compromised, a published report claims the tech company complied with a government order to scan all customer's email for certain combinations of characters in real time.

According to the exclusive report by Reuters, three former Yahoo employees with direct knowledge of the activity said the scans were carried out on behalf of an unnamed U.S. intelligence agency. The purpose of the scans was not revealed, though it likely involved monitoring of suspected terrorist activity.

If true, it would probably be the first time that an American internet company aided the government by searching real time communications, rather than turning over stored messages or monitoring a limited number of accounts in real time.

Mayer made the call

Two of the former Yahoo employees say the decision to comply with the government order was ultimately made by Yahoo CEO Marissa Mayer, and it proved to be highly controversial. They linked the decision to last year's resignation of chief information security officer Alex Stamos, who now works at Facebook.

Everyone else allegedly involved is remaining tight-lipped. Reuters said Facebook declined to make Stamos available for an interview. It quoted a terse statement from Yahoo that said only "Yahoo is a law abiding company, and complies with the laws of the United States," leaving readers to draw their own conclusions.

Meanwhile, Reuters reports no one in the U.S. intelligence community is saying anything.

Yahoo rival Google, meanwhile, had no hesitation about commenting. A spokesman told Reuters the internet company had not been asked to scan emails, but if it had it would have refused. Microsoft also told Reuters it had not been approached.

Was Yahoo alone?

Security experts, however, said it was unlikely the intelligence services only approached Yahoo, since it was not determined which email service the target used.

“Based on this report, the order issued to Yahoo appears to be unprecedented and unconstitutional, American Civil Liberties Union (ACLU) staff attorney Patrick Toomey said in a statement. “The government appears to have compelled Yahoo to conduct precisely the type of general, suspicionless search that the Fourth Amendment was intended to prohibit.”

Toomey said customers who use email services like Yahoo are counting on technology companies to stand up to novel spying demands in court.

Last month Yahoo confirmed that 500 million user accounts had been compromised by hackers.

User information including name, email address, telephone number, date of birth, passwords, and, in some cases, security questions and answers were stolen almost two years ago.

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