A Huxley woman accused of killing her newborn twin daughters and hiding their bodies in the trunk of her car has pleaded not guilty.

Jackie Burkle is charged with two counts of first-degree murder. She is being held on $1 million bond.

Her attorney entered a written plea of not guilty on her behalf Monday morning in Story County District Court in Nevada.

Police found the infants' bodies in the trunk of Burkle's car on Jan. 7 after receiving a call to check on her.

Court records show Burkle appeared pregnant at work at a Huxley convenience store Jan. 5. She no longer looked pregnant two days later, prompting a co-worker to call police.

Police have not released a cause of death or why Burkle gave birth at home.