Search giant Google said in a blog security on the Internet, that a clear warning message will appear in the top bar for the user account in Google, as illustrated by the following picture, if the discovery of attempts to penetrate to the user account on Google.
Google described some cases that may be exposed to the user account in Google at risk, and may be pointed out that attempts to penetrate the "organization" and "systematic" and stands behind countries
Suggested by Google to see this warning on his account in Google quickly change the account password to other, more complex, as well as a tool to use 2-step verification to secure the account, with the renewal of a browser and disable all existing additions.
"This warning does not necessarily mean that your account has been hacked, but it does mean that there are doubts that this account may be" under surveillance and tracking "of a third party."Source:
HERE