Marian Bates was killed by robbers on Tuesday

Mrs Bates was killed as she tried to shield her daughter from being shot during a raid on her shop in Arnold.

The shopowners say they are overwhelmed by the public support for their reward-money appeal.

Richard Hill, from the Cash Generator Shop on Arnold's Front Street, says local businesses want to play their part.

Police review

Gedling MP Vernon Coaker, who represents the Arnold area, has called for an immediate review of policing levels in Nottinghamshire.

The Nottinghamshire Police Authority has already called an emergency meeting for next Thursday to discuss the incident and the force's response to gun-related crime.

Marian's husband Victor Bates said: "It's all very well having record numbers of officers, but what are they doing and where are they when we need them."

Mr Bates, 64, whose grandfather and brother-in-law served with the police, added: "Instead of being on the streets and preventing crime, they are stuck in rooms, forming committees to investigate the relatives of drug dealers.