Social media giant Meta said on Friday that a hacking group linked to Iran was responsible for "malicious activity" on Whatsapp. Meta's security team had blocked a "small cluster" of Whatsapp accounts posing as support agents for tech companies.

The Justice Department plans to file criminal charges in the hacking of Donald Trump’s presidential campaign, two law enforcement officials told NBC News.

The FBI investigation has focused on an online persona named “Robert” who contacted American reporters, according to people familiar with the matter.