The former officer, Thomas Webster, served in a New York Police Department unit that provided security for the mayor, Gracie Mansion and City Hall, according to a law enforcement official.
Mr. Webster, 54, a former Marine, surrendered to the F.B.I. on Monday and was charged with six counts relating to the attack on an officer from the Metropolitan Police Department in Washington, D.C., and his participation in the violent attempt to stop Congress from certifying the presidential election results.
A federal prosecutor said there were videos of Mr. Webster attacking the Washington officer, first with a metal flagpole that earlier had flown a Marine Corps flag, and then with his bare hands.
According to court documents, after the officer wrestled the flagpole away from Mr. Webster, the former Marine tackled the officer, pinned him to the ground, straddled him and attempted to rip off his face shield and gas mask — an attack that left the officer unable to breathe.
...
Ultimately, the judge...ordered him held without bail pending another hearing.
