mass grave

A mass grave is a grave containing multiple human corpses, which may or may not be identified prior to burial. Mass graves are usually created after many people die or are killed, and there is a desire to bury the corpses quickly for sanitation concerns. Although mass graves can be used during major conflicts such as war and crime, they may also be used after a famine, epidemic, or natural disaster. In disasters, mass graves are used temporarily for infection and disease control. In such cases, there is often a breakdown of the social infrastructure that would enable proper identification and the individual disposal of each body.
The United Nations has defined a criminal mass grave as a burial site containing three or more victims of execution, although an exact definition is not unanimously agreed upon.

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