The gunman who shot and killed a soldier near the Canadian parliament made a video saying he was driven by "ideological and political motives", police said.
Royal Canadian Mounted Police Commissioner Bob Paulson said they had "persuasive evidence" of the reasons behind Michael Zehaf-Bibeau's attack last week.
The clip cannot be released at this time but officers are conducting a detailed analysis of the footage.
Zehaf-Bibeau was shot dead at the scene after killing Corporal Nathan Cirillo, 24.
The attack in Ottawa came two days after a man described as an "IS-inspired terrorist" ran over two soldiers in a parking lot in Quebec, killing one and injuring the other before being shot to death by police.
Five people have been hurt, one critically after an industrial explosion in Sarnia, Ontario according to the local mayor Mike Bradley reports CBC News.
He added that the fire at the facility is now under control.
Sarnia police said on Twitter there had been an explosion at a tank car maintenance facility and rescue workers were at the scene.
Explosion at tank car maintenance facility on Scott Rd. Injuries reported. Please stay off Scott Rd. Sarnia Fire on scene.
Multiple people have been injured after an industrial explosion in Sarnia, Ontario, the Canadian Broadcasting Corp reported.
The broadcaster said it was unclear exactly what caused the explosion.
The body of Canadian soldier Corporal Nathan Cirillo has been taken from an Ottawa funeral home to his hometown of Hamilton.
Cirillo was murdered on Wednesday as he stood guard at the Canadian National War Memorial in Ottawa.
Hamilton police and members of Cirillo's regiment, the Argyll and Sutherland Highlanders, joined his family to accompany his casket home.
Security alerts have been declared in the Turkish city of Istanbul after the consulates of five western countries were sent packets of unidentified yellow powder, Reuters has reported.
Sixteen people were taken to hospital as a precaution after the suspicious deliveries to the consulates of the United States, Canada, France, Germany and Belgium, including 10 from the Canadian consulate.
The packets were treated as a heightened potential threat following the militant attacks in Canada this week with other consulates and embassies reviewing their security measures.
Tests on the powder will be delivered on Monday.
The woman who tried to resuscitate Nathan Cirillo as he lay dying at the Canadian National War Memorial has given an emotional radio interview about her experience.
Barbara Winters told CBC Radio she hoped Cpl Cirillo's parents would be comforted to know he had not died alone.
Sorry, this content isn't available on your device.
A woman who tried to save the life of Cpl Nathan Cirillo after he was shot in Ottawa has revealed what she told the soldier moments before he passed away.
Lawyer Barbara Winters was at the National War Memorial when Cirillo was gunned down by Michael Zehaf-Bibeau.
"I told him he was loved and that he was a brave man and that he was a good man," she told CBC radio.
"I hope that's some comfort to his parents that he didn't just bleed alone on a sidewalk."
The blockade on the Tomb of the Unknown Soldier in Ottawa has been lifted, allowing mourners and well-wishers to leave floral tributes to Cpl Nathan Cirillo.
Cpl Cirillo was shot dead by gunman Michael Zehaf-Bibeau on Wednesday.
Zehaf-Bibeau was himself then shot and killed by Canada's Sergeant-at-Arms, Kevin Vickers.
Police now say they believe Michael Zehaf-Bibeau did act alone, in other words this was the classic lone wolf attack that is so difficult to prevent and to anticipate.
Zehaf-Bibeau was not one of the 93 so-called aspirational jihadist who was actually under active surveillance but he had applied for a passport and that application had been denied.
Police are now saying that it may have been that setback that actually triggered the attack on parliament. In other words it was an act of fury for not being able to join the jihadist struggle in the heartland of Iraq and Syria.
But for counter terrorism officials and for police far beyond Canada, the question is how many others may still try and emulate what Zehaf-Bibeau did here yesterday.
A picture of two dogs owned by Cpl Nathan Cirillo, who was shot and killed at the War Memorial in Ottawa yesterday, shows the pair looking sadly out at the press outside his home.