MISSISSAUGA, Ont. - An investigation into injuries a 34-year-old man suffered during the G20 demonstrations in Toronto has been reopened.

Joseph Thomson was arrested on June 26 in the Queen Street West and Spadina Avenue area during an assembly of G20 demonstrators.

Thomson was arrested after allegedly interfering with the arrest of a friend and at some point was struck in the face, fracturing his nose.

Ontario's Special Investigations Unit conducted an investigation, but said in November that it found no basis to conclude that the officer used "excessive force."

However, SIU director Ian Scott says the probe has been reopened as a result of reviewing video of the incident and examining a number of still images.

The SIU investigates reports involving police where there has been death, serious injury or allegations of sexual assault.