Canada's gun control laws ban dozens of assault rifles, but some permitted firearms are easily modified for greater damage, and more lax regulations in the United States make smuggled weapons accessible, experts said after a rare Canadian mass shooting on Sunday.

A man was charged on Monday with six counts of first-degree murder and five counts of attempted murder with a restricted weapon in the shooting at a Quebec City mosque.

Police have not commented on the type of gun used, but sources said it was a semi-automatic weapon.