Passaic County prosecutor investigating after shots fired by police injure person

The Passaic County prosecutor is investigating shots fired by police that injured one person. 
It happened around Garrison Street after 3 a.m. Saturday.
Police were arresting a person for unlawful possession of a firearm when they heard shots fired.
Once they responded to that second incident, the officer discharged his weapon, striking an individual.
The person was taken to the hospital for treatment.