Gmail mistakenly sent thousands of its users a security alert, notifying them that an unknown device had signed into their account.
The number of affected users is currently unknown but the issue was widespread enough for Google to issue a notification about it in its Admin Panel.
Google is now investigating the matter and said it had identified a potential cause, though it did not specify further, DevonLive reports.
A "new device sign in" notification means that someone else has already successfully signed in to your account.
Gmail informed users to change their passwords "right away."
The messages are what Google is describing as a "service issue," and it appears the messages were sent in error with no security threat to accounts.
