The governor of New York has instructed to double protection at important infrastructure facilities in the state

"I am sending 100 additional soldiers to the National Guard of New York and instructing state law enforcement agencies to double guard at key facilities in New York," said Cuomo, published on his official Twitter page.

He stressed that the main priority for the authorities is public safety.

Also, the Federal Bureau of Investigation (FBI) of the United States appealed to the Americans for help in finding the culprit in the mailing of improvised explosive devices by mail to a number of major political figures and CNN television.

Earlier it became known that former US President Barack Obama and the family of politicians Hillary and Bill Clinton were sent bombs. A suspicious package was also sent to the CNN office.