During the midnight premiere of Batman: The Dark Knight Rises at a theatre in Aurora, Colorado, a young man dressed in black body armour, a gas mask, with guns strapped around his lap appeared through the emergency exit. He threw a canister of tear gas into the audience and commenced firing his weapons. Twelve people were killed and another 58 were injured. The gunman was apprehended and now awaits trial. His lawyer will argue that he suffers from a mental illness. This mass murder has re-ignited a public debate about gun laws in the United States, although President Barack Obama and other political leaders hesitate to propose or amend existing laws.