A gunman is believed to have been shot dead by police after barricading himself in a Walmart store with at least one hostage.

Officers were sent to the scene in Amarillo, Texas after a reported shooting.

A number of people were evacuated from the store.

A SWAT team then went into the building searching for the suspect and opened fire on him.

Nobody else is believed to have been injured or killed in the incident, which is thought to be workplace-related.