Pure horror unfolded at a Walmart in Nebraska when a 31-year-old woman held a child at knifepoint. “How did this escalate so quickly in a public place like Walmart, and could it have been prevented earlier?

Shocking new images show a woman wielding a knife at a young child in Omaha, Nebraska.

The suspect approached a female shopper and a 2- or 3-year-old boy, then displayed a large knife she had shoplifted from the store and "took possession of the child, essentially kidnapping the child,"...