Colorado movie theater shootiing among deadliest in history

At least 12 people were killed when a gunman, suspected to be 24-year-old James Holmes, opened fire inside a movie theater in Aurora, Colo. on Friday morning.

As the death toll fluctuates, the shooting still remains as among the deadliest in the United States.

Click on the red dots on the map to learn more about other deadly mass shootings worldwide.