Dan Mitchinson: US correspondent explains how a quick police response may have saved lives during Nashville shooting - Heather du Plessis-Allan Drive

A quick police response may have saved lives in an American school shooting this week.

A 28-year-old former student killed six children and adults at a Christian elementary school in Nashville.

US correspondent Dan Mitchinson says police responded much more slowly last year to a mass shooting in Uvalde, Texas.

But he says this time it was different and they had no hesitation in shooting the attacker dead.

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