Gunman Michael Zehaf-Bibeau made a politically charged video recording before last week's attack, the RCMP said on Sunday.
Police also say they believe the knife Zehaf-Bibeau was carrying was taken from his aunt's property. He had lived there years earlier and appeared to have stored the knife on the property.
Authorities are still looking into the origin of the gun used in the deadly attack that left Cpl. Nathan Cirillo dead.
Zehaf-Bibeau subsidized his pre-attack activities from his own earnings, police said.
Zehaf-Bibeau fatally wounded Cirillo before driving to Parliament Hill to find himself one unlocked door away from Prime Minister Stephen Harper and the entire Conservative caucus.
A harrowing compilation of security video released on Thursday provided a picture of how Wednesday's attack unfolded.
Now, police are releasing information on Zehaf-Bibeau's potential motivation and the events leading up to the attacks.