National Security Agency leaker Edward Snowden says the exposure of malicious software allegedly linked to his former employer may be a message from Moscow.

Information security experts have been abuzz since an unknown party uploaded a suite of tools purported to have been stolen from the Equation Group of hackers, which some have tied to the powerful U.S. spy agency.

The Equation Group was exposed last year by antivirus firm Kaspersky Lab, which described it at the time as a “God of cyberespionage.” Many have since speculated that the NSA is behind the group.

As experts picked through the tools Tuesday, Snowden took to Twitter to say that the leak was “likely a warning” from Moscow to the United States.

The NSA did not return a message seeking comment.

(AP)