Police in the Canadian city of Quebec have arrested a man on suspicion of killing two people and injuring five others in a stabbing rampage on Halloween on Saturday.

The provincial police had been looking for a man dressed in medieval clothing and armed with a bladed weapon who had left "multiple victims".

Police said the suspect was in his mid-20s.

They confirmed that two people had died and five others were hurt.

There was no word on a possible motive for the attacks.

Police said five victims were transported to a hospital, however there was no immediate word on their conditions.

"Shortly before 1am, the SPVQ (Quebec city police force) arrested a suspect," the force said on Twitter, asking residents of the city to "stay inside with the doors locked" because an "investigation is still ongoing".

A man was arrested early on Sunday.