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The attack started when a man driving a white Chevrolet Malibu careened through a police checkpoint outside a Saturday night football game, knocking a police constable to the ground and attacking him with a flurry of blows with a knife.

It ended a few hours later, when police flipped a U-Haul truck used by the same suspect to crash through pedestrians along Jasper Avenue.

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One woman remains in hospital, but remarkably, no one was killed.

To many, what happened in Edmonton on Sept. 30 was a terrorist attack. Police Chief Rod Knecht said it was being investigated as such during a 3 a.m. news conference that morning. On a recent visit to Edmonton, Prime Minister Justin Trudeau called the incident an act of terrorism.

But one month later, no terrorism charges have been laid.

Legal and terrorism experts say the gap between the public perception of the attack and the lack of terrorism-related charges highlights the difficult task investigators and prosecutors face in proving why someone did something.