<sod >Canadian police say an attack on an officer outside a football game and a high-speed chase of a U-Haul that left four people injured are being investigated as acts of terrorism.< eod>< sod > Canadian police said early Sunday that an attack on an officer outside a football game with a car and knife and a high-speed chase of a U-Haul that left four people injured in the western city of Edmonton, Alberta, are being investigated as acts of terrorism.< eod>