Niagara Regional Police are on site in Niagara Falls investigating.
Police say just before 10:30pm, officers responded to a large disturbance at a motel in the Lundy's Lane and Montrose Road area.
At last update, one suspect was still outstanding while K9 dogs were assisting in the search. Police haven't given specifics into the incident, but add that they believe it was targeted and there's no risk to public safety.
(Written by: Matt Latour)