Ottawa police have arrested two 15-year-old girls believed to be responsible for a makeshift bomb found in a McDonald's restaurant on Rideau Street last Monday.

The girls, who can't be identified due to the Youth Criminal Justice Act, were charged with mischief connected to the incident.

Police said a suspicious package was found late Monday night at the fast-food restaurant and it was later identified as a fake bomb.

The girls, both from Ottawa, will appear in court at a later date, police added.