Montreal A 24-year-old man has been arrested following an altercation at a Montreal-area mosque that left three people injured on Friday afternoon.24-year-old man has been arrested, police say motive behind incident is unknown The incident took place at around 1:40 p.m. in Châteauguay, Que., on Friday. (Paula Dayan Perez/CBC)A 24-year-old man has been arrested following