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Several have been left injured following a terror attack in Canada.

A car was deliberately driven at pedestrians outside an American football game in Edmonton.

The motorist drive at 'high speed' towards a police checkpoint outside the game.

He crashed through the barricade and hit a police officer sending him flying 15ft into the air.

The driver then jumped out and "viciously" attacked the injured officer, stabbing him several times, before running away.

Just hours later police investigating the earlier attack pulled over a truck. While they checked the driver's documents he drove off and a patrol cars chased after him.

(Image: REUTERS)

Police described how the truck deliberately tried to hit pedestrians on the pavement during the pursuit, leaving at least four injured.

At a press conference, police said they were treating the two incidents as "acts of terror" and said that while they believed the attacker "acted alone" they were not ruling out that others may have been involved.

Police have also confirmed an ISIS flag was seen in the suspect's vehicle.

Pictures from the scene of the first incident show a white Chevrolet Malibu smashed into the front of an Edmonton Police Service SUV outside the city's Commonwealth Stadium, where more than 30,000 fans enjoyed the game.

At about 8.15pm local time last night (3.15am UK time), the man got out of the vehicle and stabbed the officer, fled on foot and remained at large, police reportedly said.

(Image: AFP) (Image: REUTERS)

The officer, manning a traffic checkpoint near 93 Street and 107A Avenue,sustained some injuries but they were not life-threatening.

It is unclear if the incident was linked to a second vehicle crash two hours later.

A U-Haul van was seen speeding through downtown streets with up to a dozen police vehicles in pursuit at about 11pm.

Injuries were reported after pedestrians were struck, Global Ca reports.

Kim Anderson was waiting for a bus when she saw the U-Haul truck hit pedestrians near Jasper Avenue and 107 Street.

“There were people flying and everything,” she told The Edmonton Journal.

“I’m shocked — I just see people flying.”

Natalie Ponn tweeted photos of the damaged vehicle said: "I'm at a wedding at the Matrix and this is outside.

"They're keeping us away from windrows/the lobby.

"Tons of police presence and closed roads immediately around Matrix."