Police said the incident happened in the area of ​​Mid Way Boulevard and Invader Crescent on August 27.
They arrived to find several people hit by gunshots.  An investigation began, and on Wednesday, police executed a search warrant at an unspecified residence and arrested a suspect.
The suspect, identified as 26-year-old Hamsa Mohammed of Toronto, faces nine charges, including two counts of attempted murder and discharging a firearm with intent.
Police continue to ask anyone with information to contact investigators at 905-453-2121 ext.  1233 or Crime Stoppers anonymously at 1-800-222-TIPS (8477).