Federal agents with Homeland Security Investigations discovered an additional 200,000 SIM cards at a location in New Jersey, law enforcement sources confirmed to CBS News.

This follows last week's discovery by U.S. Secret Service of a sprawling telecommunications network in the New York tri-state area that investigators said could potentially have caused a serious disruption to New York's telecom systems and threatened the United Nations General Assembly meetings.

Agents were first tipped off last spring, and officials believe that among other foreign links, the telecommunications network was connected to Chinese actors, according to two law enforcement sources briefed on the probe.

Authorities still have not made any arrests.

The seizure announced by the Secret Service last

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