Detectives are trying to track down more witnesses to a robbery in Shipley on Wednesday night.

A 51-year-old security guard was struck from behind while he was filling the cash machine at Abbey National Bank in Westcroft at about 8pm.

The guard was bruised and shaken but not badly injured. The gang of three made off with a "substantial amount of money" from the cash box.

Detective Inspector Trevor Gasson, of Keighley CID, said: "We are trying to trace a group of young girls who were at the bottom of Wellcroft and another woman who was using the HSBC cash point at the time the Securicor van was parked outside the Abbey National.

"We would ask for these people to come forward and talk to us."

One witness described the attacker who hit the security guard as between 17 and 19 with dark hair. There were two look-outs, one with a dark-coloured top with an emblem on the left and the other wore a plain grey sweatshirt with the hood up.

They escaped in a dark red or maroon four-door Ford Mondeo.