Electrical stun device held to woman's neck
A masked robber threatened a female supermarket worker by holding an electrical stunning device to her neck.
He demanded cash from staff at Sainsbury's on High Street, Newhall, at about 09:30 GMT.
A spokesperson for Derbyshire Constabulary said the device was not discharged but the woman was treated by paramedics for minor injuries.
The offender was wearing a dark tracksuit, dark hat and a dark covering over his face.
Officers are at the scene but it is not yet known if anything was taken.
Police said the device was about the size of a mobile phone.
A spokesperson for the store said: "We called an ambulance and our colleague was treated on site.
"Of course we will support her in any way we can after this very traumatic incident."