Welcome to the American Khanate.
The Mongols ordered that, apart from four hundred artisans. .., the whole population, including the women and children, should be killed, and no one, whether woman or man, be spared. To each [Mongol soldier] was allotted the execution of three or four hundred Persians. So many had been killed by nightfall that the mountains became hillocks, and the plain was soaked with the blood of the mighty.
Some historians believe that over one million people died in the aftermath of the city’s capture, including hundreds of thousands of refugees from elsewhere, making it one of the bloodiest captures of a city in world history.”
Source Wikipedia