The collision occurred on 9 November. Two police officers from the 12th precinct pretended to be drug dealers, hoping to catch the potential buyers agents. At this point they were approached by two other law enforcement officers from 11 division — in the image of clients.

The second pair of police officers suddenly pulled out guns and ordered the first to lie on the ground. Then the rest of the officers of the 12th precinct broke into a nearby house to have a search. However, there are already police officers worked from the other group.

In the end, a fight ensued, during which the police began to "brandish a weapon". After the incident one of the victims was hospitalized.

About the incident informed the leadership of the departments. The investigation is ongoing.