‘top-level federal memo warning of a potential “violent act of terrorism in Canada” was distributed by the prime minister’s staff five days before last month’s attack on Parliament Hill, according to a copy obtained by CBC News.

The memo was circulated on the evening of Friday, Oct. 17 — three days before the Oct. 20 hit-and-run attack in St-Jean-sur-Richelieu, Que., by Martin Couture-Rouleau and five days before the Oct. 22 shooting in Ottawa by Michael Zehaf-Bibeau.’

Read more: Ottawa shooting: Federal security chiefs warned days before attack