The agency says it found a network of some 300 servers and 100,000 SIM cards—enough to knock out cell service in the NYC area. Experts say it mirrors facilities typically used for cybercrime.

A “nation-state” is said to be involved.

The agency says it found a network of some 300 servers and 100,000 SIM cards—enough to knock out cell service in the NYC area. Experts say it mirrors facilities typically used for…