The offence happened at the Queens Head Hotel, on Market Street, overnight on Saturday.
They attacked the bandit, before making off with a quantity of cash. Police are withholding how much was stolen.
Anyone with details should call police on 101.
Thieves raid bandit at Alnwick pub
Thieves raided a bandit machine in an Alnwick pub after gaining entry to the premises via an insecure fire door.
By The Newsroom
Wednesday, 16th March 2016, 4:05 pm
Updated Wednesday, 16th March 2016, 4:11 pm