Mass shootings have horrified Americans for years with the latest one in Maine thought to have claimed the lives of at least 22 people, these are the most shocking attacks in American history.
Horrifying McDonald s massacre as gunman hunting humans slaughtered 21 innocent people dailystar.co.uk - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from dailystar.co.uk Daily Mail and Mail on Sunday newspapers.