Justin Bieber 'Attacker' in NYC Allegedly Turns Out to be Undercover Cop

While in New York City today promoting his new fragrance, pop singer Justin Bieber was signing autographs outside Macy's in Midtown Manhattan. That's apparently when he was rushed by a crazed fan, causing Beiber's security team to step in and Beiber himself to get defensive. But there's just one problem. The "crazed fan" was allegedly an undercover cop who actually tried to step in to control the crowd.

TMZ reports:

A member of Justin Bieber's personal security team was cited for disorderly conduct today after the singer had a frightening run-in with an undercover cop in NYC ... but it was all one MAJOR misunderstanding.

Bieber was signing autographs outside of Macy's when the crowd became unruly ... and a plainclothes police officer rushed to help the singer.

Problem is -- Bieber didn't know the guy was a cop -- so when the cop got close to Justin ... Bieber got defensive thinking he was a crazy fan.  A member of Bieber's security team immediately grabbed the cop and tried to pull him away.

The cop quickly identified himself -- and cited the security team member for disorderly conduct.

ABC7 in New York originally reported that Bieber was "assaulted" by an unidentified man outside Macy's when the singer went outside to address the crowd:

Witnesses say when Justin Bieber came out the doors an unidentified man jumped a barrier and knocked the teen sensation to the ground.

Bieber was not injured but appeared to be very 'shaken up'.

Witnesses say Bieber was swinging back at the man.

Video posted on YouTube shows a birds-eye view of the incident (language warning):

TMZ reports that the cop and Bieber's security team did get the situation sorted out.