Facebook has released an update regarding the mass security breach that happened a few weeks ago.

The platform reports that around 30 million users have had their login tokens stolen. A login token is assigned to a profile so a user doesn't have to re-enter their password. 

According to a blog post from Facebook, the attackers took advantage of a number of software bugs in order to attain login tokens and take over someone's account. 

The attackers targeted around 400,000 people and used their information and friends list to hop from profile to profile, eventually ending up with around 30 million tokens. 

The company reports that around 15 million of those accounts had personal information accessed, including username, gender, locale/language, relationship status, religion, hometown, self-reported current city, birthdate, and workplace.

Facebook is now working alongside the FBI to track down the source of the attacks. Users can check whether their profile was affected by visiting the help centre.