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A terror attack in Canada has left several injured after a cop was stabbed and a car deliberately rammed pedestrians driven by a suspect with an ISIS flag.

Police said that the attack began with a man, 30, driving his car "at high speed" at a police checkpoint outside an American football game in Edmonton, Alberta, attended by thousands of people.

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.

EPS Chief Rod Knecht said: “The vehicle struck the officer, sending him flying into the air fifteen feet, before colliding with the officer’s cruiser, again at a high rate of speed."

Just two hours later, police investigating the earlier attack pulled over a truck.

(Image: @PonNatalie/Twitter)

(Image: @PonNatalie/Twitter)

The suspect, from Edmonton, fled when his name was recognised as the owner of the vehicle used in the initial attack, according to local media.

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 - photos of which were taken by local media at the scene.

Knecht said: “Throughout the chase, the truck deliberately attempted to hit pedestrians in crosswalks and in alleys in two areas along Jasper Avenue.

“It is believed at this time that these two incidents are related, based on evidence at the scenes, and actions of the suspect, at 12:38 a.m. today, it was determined that these incidents are being investigated as acts of terrorism."

The driver was apprehended and is in custody.

(Image: @GlobalCalgary/Twitter) (Image: Global News) (Image: @ZoeHTodd/Twitter)

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.

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

(Image: Global News) (Image: Icon Sportswire) (Image: The Canadian Press)

Witnesses said a man was arrested at the scene.

Pat Hannigan told The Edmonton Journal he was across the street when he saw the truck flip over.

“They (police) were pulling him out of the windshield, then handcuffed him,” he said.

Kim Anderson saw the U-Haul truck hit pedestrians near Jasper Avenue and 107 Street.

“There were people flying and everything,” she told the paper.

“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."