FLORENCE, Ariz. — An Arizona mother has pleaded not guilty to murder and other charges in the deaths of her two small children.

Video from KPHO-TV shows 20-year-old Brittany Velasquez remaining silent for most of her arraignment Friday in Pinal County Superior Court.

Authorities say Velasquez’s 2-year-old son and infant daughter were found dead March 26 in a car in the town of Superior. The children had been left strapped in car seats for 14 hours.

Investigators believe she was the last person to see them alive and that there was evidence of foul play.

Velasquez previously said someone else was supposed to be watching the children that day.

Velasquez, who is being represented by a public defender, is facing two counts each of second-degree murder and child abuse.

Information from: KPHO-TV, http://www.kpho.com/

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