Sarnia police and Lambton EMS responded to an assault call in the 100-block of Ontario St. just before 10:30am Friday.
Two males were transported to Bluewater Health for treatment.
Members of the Criminal Investigations Branch continue to investigate. Uniform Patrol officers and the Forensic Identification Branch remain at the scene.
If you have any information that may assist investigators please contact Detective Sergeant Dwayne Whelpley at 519-344-8861 ext. 6151.