A collaborative training exercise between police, fire and EMS personnel took place at Mount Kisco Elementary School on Wednesday night to ensure active-shooter responses are as coordinated as possible.

The Westchester County Police wrote on its Facebook page that the "Active Shooter Hostile Event (ASHE) drill focused on the protocols and procedures to be utilized by first responders at any large-scale incident."

The exercise found groups of personnel from each agency forming into teams, or "rescue task forces," that could be deployed to get medical aid to victims as quickly and safely as possible.

The new training technique was developed in response to different incidents across the country where emergency responders were unable to reach victims because of the presence of an active threat.