There are more questioins than answers concerning a murder in Nebraska involving a two people arrested in Central Iowa over the weekend.

A mother and her son were arrested in Newton on Saturday. Authorities there say they were taken into custody after a report of a mugging in a parking lot. Once Shelly Casterline and her son Andrew Casterline were in the Jasper County Jail, that's when police found out about them being wanted in connection with a murder in Webster County, Nebraska.

That's where the details stop. Officials in Nebraska have yet to say what circumstances led them to believe the Casterlines were involved in the murder, nor have they said anything yet about the killing itself.