Washington (AFP)

The US Secret Service on Tuesday said it had dismantled a network of more than 100,000 SIM cards that could have crashed New York's telecommunications network ahead of the UN General Assembly.

"In addition to carrying out anonymous telephonic threats, these devices could be used to conduct a wide range of telecommunications attacks," the agency said in a statement.

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"This includes disabling cell phone towers, enabling denial of services attacks and facilitating anonymous, encrypted communication between potential threat actors and criminal enterprises."