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OTTAWA — The RCMP believes it has “come to a dead end” in its probe of where Parliament Hill shooter Michael Zehaf Bibeau got his gun one of the most vexing questions about the events of Oct. 22, 2014.

The Mounties continue to investigate several threads of what happened that day, including whether Zehaf Bibeau had accomplices, but have not gathered evidence sufficient for criminal charges.

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A source with direct knowledge of the police investigation provided the update to The Canadian Press on condition of anonymity due to the ongoing sensitivity of the file.

On Wednesday, crowds will gather for Remembrance Day ceremonies at the National War Memorial, where Zehaf Bibeau killed honour guard Cpl. Nathan Cirillo, shooting him in the back three times with a .30-30 Winchester rifle.

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The attacker quickly made his way up Parliament Hill and into the Centre Block before being gunned down in the Hall of Honour, not far from then-prime minister Stephen Harper and countless MPs.