Police are hunting an armed robber who threatened staff at the Royal Bank of Scotland in Dudley town centre and took thousands of pounds.
It was believed the raider had a concealed weapon.
No-one was hurt during the raid on the High Street bank at 10.15am on Christmas Eve
Police were called and the branch was closed for the rest of the day.
The bank reopened yesterday morning.
Detective Constable Stephen Goddard said: “High Street would have been busy with Christmas shoppers at the time and we want to hear from anyone who saw the man responsible and can help us identify him.
“We are following up a number of lines of enquiry which will include examining CCTV footage from the bank and the surrounding area.”
David Gaffney, the spokemsan for the Royal Bank of Scotland, said that they were working with police.
Anyone with any information about the incident should telephone police on 101 or the independent charity Crimestoppers anonymously on 0800 555 111.