The Secret Service said Tuesday it had dismantled a vast network of electronic devices in the New York metropolitan area that officials say posed an imminent threat to senior U.S. government officials and the city’s telecommunications infrastructure as the United Nations General Assembly convenes in Manhattan.

Matt McCool, special agent in charge of the Secret Service’s New York Field Office, said on Sept. 23 that the action followed a months-long protective intelligence investigation that began earlier this spring after multiple telecommunications-related threats were directed at senior government officials.

“This was a difficult and complex effort to identify the source of these fraudulent calls and the impact on the Secret Service protective mission,” McCool said.

He emphasized that

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