Google Gmail Data Breach: How To Tell if You've Been Hacked and What to Do

A recent data breach has put 2.5 billion Gmail accounts at risk. To check for a compromise, one should look for unauthorised changes to security settings, strange activity in Google apps, or unknown financial transactions. (Credit: Pexels)

Google has reportedly informed 2.5 billion Gmail account holders about a 'successful intrusion' carried out by a password-hacking group.

According to reports, the incident occurred between 8 and 18 August, during a widespread attack that exploited compromised Open Authorisation (OAuth) tokens.