The investigation has led to the subpoena of two -- and possibly more -- big smartphone makers who had partnered with the social networking company in a deal that gave access to personal information of a vast number of Facebook users, the Times reported, citing anonymous sources.
"It has already been reported that there are ongoing federal investigations, including by the Department of Justice," a Facebook spokeswoman told TheStreet in response to queries about the report. "As we've said before, we are cooperating with investigators and take those probes seriously. We've provided public testimony, answered questions, and pledged that we will continue to do so."
Dozens of big tech companies like Amazon.com, Inc. (AMZN - Get Report) and Apple Inc. (AAPL - Get Report) had previously had agreements with Facebook that gave them windows into information about users' friends and other personal data, according to reporting by the Times.
The subpoena is led by the U.S. attorney's office for the Eastern District of New York, according to the Times.
The news follows reports earlier in the day of bugs in Facebook and Instagram service.