Police were called to Old Montreal Friday Morning to investigate a report of four people who were kidnapped.
A 911 call was made at around 4 a.m. about a conflict in an apartment building on de la Commune Street near St-Hubert Street.
When officers arrived, they received information that led them to believe that there was a quadruple kidnapping.
Investigators from the major crime unit are leading the investigation.
Police did not release any further details as the investigation is ongoing.