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Nashville police release video of armed suspect in school
01:35

A former student shot through the doors of a Christian elementary school in Nashville on Monday and killed three children and three adults, after elaborately planning the massacre by drawing out a detailed map and conducting surveillance of the building.

Video released by the Metro Nashville Police Department shows a person walking through the school hallways, going through several doors while pointing a gun.

The massacre in Nashville, where three of the six victims were nine years old, was the latest in a series of mass shootings in a country that has grown increasingly unnerved by bloodshed in schools.

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