Facebook is under wider scrutiny for how it handles user data.
The FBI, Securities and Exchange Commission, and Federal Trade Commission have reportedly joined the Justice Department's investigation into the relationship between Facebook and data firm Cambridge Analytica.
The expanded probe, first reported by the Washington Post, centers on why it took so long for the social media company to disclose the fact that Cambridge had gained access to information on tens of millions of users.
Facebook has said it learned back in 2015 that Cambridge was using data gleaned from its platform to create voter profiles of users, but it only made that revelation public this past March. And while the company said it changed its data policies years ago to prevent third parties from accessing private information, just last week it said as many as 61 app developers were able to get that information even after those changes were implemented.
Shares of Facebook, which have more than recovered from the initial Cambridge scandal and hit an all-time high last month, were down on the news.