Footage of an armed robber being fought off by customers and a cashier at a Berkshire betting shop has been released in a bid to catch the raider.
The masked man walked into Coral bookmakers in Tilehurst, Reading on the evening of 28 March, holding a knife.
As he started taking cash from the till, two customers used stools and chairs in an attempt to stop him but he fled with £1,000.
A £5,000 reward has been offered by the bookmakers for vital information.
The CCTV film shows the raider barging his way into the rear of the shop where he helps himself to cash from the till.
However, he is spotted by two customers who advance on him.
One throws the chair at him, while the other hits him on the back with a stool. The woman cashier then joins in, trying to grab and smack him.
The offender then manages to break clear and flees the shop.
He was wearing an army-coloured ski mask and aged in his early 20s.
Det Con John Yallop, from Newbury CID, said: "The footage is quite dramatic and shows two men acting very bravely in using stools and chairs to try to prevent the offender from getting the money.
"I hope that by releasing this footage, members of the public who have information about this incident and who have not yet come forward, will speak to police."
The reward has been offered by Coral along with the Association of British Bookmakers Ltd.