Google has warned most of its 2.5 billion Gmail users to update their passwords and strengthen their account security as password hackers have carried out a significant amount of “successful intrusions.”

It is advising users to be on high alert for suspicious activity and add extra security measures, like two-factor authentication, if they have not already.

Hackers often access Gmail passwords by sending emails with links to fake sign-in pages, or by tricking users into sharing their two-factor authentication codes.

Google has warned most Gmail users to update their passwords and strengthen their account security. PA Images via Getty Images

While most users have strong, unique passwords, only a third regularly update these keys, according to Google data.

Separately, Google has also a

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