A 30-year-old Somali refugee faces numerous charges, including participation in a terrorist activity, for Saturday's violence in Edmonton.
Police haven't named the suspect, but say he was arrested with a flag for the Islamic State group in one of his vehicles.
He's accused of ramming a police cruiser and stabbing an officer, outside the Edmonton Eskimos Football game at Commonwealth Stadium.
A few hours a U-Haul van was stopped at an impaired driving checkpoint north of Downtown.
The driver sped off with police in pursuit and police say he intentially swerved into pedestrians, injuring four people.
R-C-M-P say the suspect was investigated in 2015 for extremist leanings, but was deemed not to be a threat.