"We didn't have sufficient evidence to warrant continued investigation of that individual following the 2015 (check)", he said.
Terming the incident as another hate crime as per the initial investigation reports, the Canadian PM said: "While the investigation continues, early reports indicate that this is another example of the hate that we must remain ever vigilant against".
A Somali refugee who attacked a policeman with a knife after striking him with his auto and then injured four others in a driving rampage in Edmonton, Alberta was charged with five counts of attempted murder Monday.
Amarnath Amarasingam, an academic co-directing a study of Western foreign fighters at the University of Waterloo, said Alberta generated about as many terrorism suspects as Quebec and Ontario in that period.
He said the call was made to keep the high-speed pursuit through the downtown, busy with late night bar and night-club goers, because of the threat posed by the suspect.
But he added: "I will absolutely tell you we are challenged for resourcing".
Police said the suspect, believed to be 30, crashed the vehicle through a barricade and hit the officer at about 8:15 p.m. local time, sending him flying 15 feet into the air and onto to a police cruiser. He tried to escape but the police gave chase, and the vehicle swerved at pedestrians to leave four of them with injuries.
A Daesh flag was later found in the auto, said police. Four people were struck.
The police officer and two pedestrians were released from hospital on Sunday, while a third pedestrian was described as critical and another suffered a fractured skull. He also is charged with one count each of risky operation of a motor vehicle and possession of a weapon for a unsafe goal, according to a charge information sheet filed in Edmonton provincial court.
US 'Does Not Recognize' Kurdish Referendum, Says Results 'Lack Legitimacy'
They come a day after Iraq instituted a flight ban that halted all global flights from servicing the territory's airports. Turkey had forged close ties to Iraq's Kurdish region, but is strongly opposed to its moves toward independence.
Degrand said an investigation was launched and RCMP interviewed the suspect, among other people.
Degrand initially said was the suspect was the process of making a refugee claim in Canada, but a spokesman with the federal Public Safety Department later clarified that he had already been found to be a refugee by the Immigration and Refugee Board.
Police said that at this time, the events in Edmonton appear to be isolated.
On Monday, an unmarked police vehicle was parked in front of the plain three-storey building listed as Mr. Sharif's address in court documents. Knecht said he was known to police, but there was no warning for the attack.
"It is pretty tragic what happened", he said.
"Our thoughts are with those injured, their family and friends, and all those affected by this senseless act of violence", Trudeau said in a statement, in which he also thanked first responders and law enforcement.
Elgie said the van hit a man who was a bar customer.
Edmonton Mayor Don Iveson urged calm and compassion. "We are part of the fabric of this country". In France on Sunday, a man with a knife attacked people at the main train station in the southeastern city of Marseille, killing two women before being fatally shot by soldiers, officials said.
"This is the other reality - we are coming to a time where extreme fringes and those voices are finding a place on the Internet", he said.