Four men have been arrested after a masked robber raided a convenience store at knifepoint.

Police were called to the McColl's shop in Debenham Crescent, Eaton Park, at around 8.30pm last night.

The masked man made off from the store with a quantity of cash.

Following their investigation, officers later became suspicious of a vehicle travelling through the city centre.

After stopping it, the four occupants were all arrested on suspicion of robbery and remain in custody for questioning.

A Staffordshire Police spokesman said: "We were called to reports of a robbery at a McColl's store.

"A male offender, wearing some sort of mask and brandishing a knife, made off with an amount of cash.

"Subsequently, following attendance and investigation, officers spotted a vehicle and stopped it.

"The four occupants were arrested on suspicion of robbery. No-one was injured in the incident.

"Any witnesses who have not yet contacted the police are urged to call us on 101, quoting incident number 797 of September 1."