The campaign is the latest case of business email compromise, which costs victims billions of dollars annually.

Investigators found scammers involved in human trafficking.

The group is believed to have hit more than 50,000 victims.

"Operation Eagle Sweep" is the latest crackdown on business email compromise (BEC) scams by international law enforcement.

Business email compromise again proved costliest, at $2.4 billion, according to the bureau's Internet Crime Complaint Center.

Cybercrime seems to be the main goal of a group Proofpoint is calling "TA2541."

The operation — with help from Palo Alto Networks' Unit 42 as well as cybersecurity firm Group-IB — marks the second action against the group.

The apps are another instance of the privacy risks educational technology poses to children, the Me2B Alliance says.

But cryptocurrency still poses a big challenge.

The sting also intercepted $27 million in illicit funds.