The mother of the man accused of killing a soldier at Ottawa's war memorial then storming Parliament before being shot dead says she is crying for the victims of the shooting, not her son.

In a brief and tear-filled telephone interview with The Associated Press today, Susan Bibeau said she did not know what to say to those hurt in the attack.

"Can you ever explain something like this?" she said. "We are sorry."
Investigators offered little information about the gunman in Ottawa, identified as 32-year-old petty criminal Michael Zehaf-Bibeau.

Canadian police conceded today that Zehaf-Bibeau was the lone gunman, the second attack in three days in what the prime minister described as terrorism.

The heart of the capital city of Ottawa had been in lockdown after yesterday's attack, with fears that other gunmen might be on the loose. Ottawa police Constable Marc Soucy confirmed to The Associated Press today that police are satisfied there was one attacker. Ottawa police Chief Charles Bordeleau told the Canadian Broadcasting Corp that "there is no longer a threat to public safety."

The two attacks stunned Canadians and raised concerns their country was being targeted for reprisals for joining the US-led air campaign against the extremist Islamic State group in Iraq and Syria.

On Thursday, Prime Minister Stephen Harper visited the National War Memorial where the soldier was killed to lay a wreath.

Earlier, Harper called the shooting the country's second terrorist attack in three days. A man Harper described as an "ISIL-inspired terrorist" on Monday ran over two soldiers in a parking lot in Quebec, killing one and injuring another before being shot to death by police. Like the suspect from yesterday's shooting in Ottawa, he was a recent convert to Islam.

Witnesses said the soldier posted at the National War Memorial, identified as Cpl Nathan Cirillo, was gunned down at point-blank range by a man carrying a rifle and dressed all in black, his face half-covered with a scarf. The gunman appeared to raise his arms in triumph, then entered Parliament, a few hundred yards away, where dozens of shots soon rang out, according to witnesses.

People fled the complex by scrambling down scaffolding erected for renovations, while others took cover inside as police with rifles and body armour took up positions outside and cordoned off the normally bustling streets around Parliament.

On Twitter, Canada's justice minister and other government officials credited 58-year-old sergeant-at-arms Kevin Vickers with shooting the attacker just outside the MPs' caucus rooms