How many undercover agents did they have in this group?

Another New York City Police Department officer has reportedly come forward and admitted that he was riding with a group of bikers who allegedly assaulted the driver of an SUV in an extreme case of road rage.

This latest officer is a five-year veteran of the police force who began working in the Internal Affairs Bureau's command center about a month ago, according to DNAinfo, a New York City online news website.
On Wednesday, undercover narcotics officer Wojciech Braszczok, 32, was charged with gang assault, assault and criminal mischief in connection with the attack on SUV driver Alexian Lien on Sept. 29.

The officer was the latest in a string of arrests connected to the incident. Five other motorcyclists have been charged, and police said they are continuing to search for suspects.
NYPD Internal Affairs Cop Reportedly Among Bikers Involved in SUV Attack - ABC News