The shooter who rampaged through Canada's parliament took a video of himself just before the attack and was inspired by ideological and political motives, police say.
However, his mother says Michael Zehaf-Bibeau, who was shot dead by police in the parliament in Ottawa after killing a soldier on Wednesday, was mentally ill and wanted to die.
But labelling it "a terrorist attack", Royal Canadian Mounted Police (RCMP) Commissioner Bob Paulson said that the 32-year-old "was driven by ideological and political motives".
Zehaf-Bibeau had prepared a video recording of himself just prior to conducting the attack.
In her letter to Postmedia News, published in Sunday's edition of the National Post, the killer's mother Susan Bibeau said her estranged son had wanted to travel to Saudi Arabia to study Islam and the Koran, not Syria to join militant fighters - as stated before by police.