United Nations May 5, 2022 12:29 pm What Is a War Crime? A war crime is an action during an armed conflict that violates the international humanitarian rules of war, often referring to violence against civilians. US & World Videos 1:41 Trump fined additional $1,000 for gag order violation and threatened with jail 0:53 Man attempts to shoot pastor during church service 3:28 Boy, 4, found dead after being swept away by floodwaters in North Texas 1:41 ‘The Mummy' turns 25: Remembering the Brendan Fraser classic 1:15 Anna Nicole Smith's look-alike daughter Dannielynn Birkhead attends 2024 Kentucky Derby