A thwarted plot to cripple the telecommunications system in New York was bigger than investigators first realized, adding to the urgency of their search for answers, sources told ABC News.

Federal agents discovered additional locations and more equipment as they work to determine the ultimate goal of what the U.S. Secret Service said was a China-linked plot that could have crippled every cell tower in the nation's largest city, jammed 911 calls, and unleashed chaos on communications networks.

Agents from Homeland Security Investigations found an additional 200,000 SIM cards at a location in New Jersey, law enforcement sources told ABC News.

That's double the 100,000 SIM cards, along with hundreds of servers, that were recently seized at five other vacant offices and apartments in an

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