An armed robber escaped with more than £700 in cash from a Haworth coffee house.
The man, who was wielding a pistol, struck at the Main Street premises at around 6.25pm on Sunday.
He pushed an assistant into a back room and threatened him with the gun, before escaping with money from a safe and till.
The robber ordered staff to lie on the floor and not to move while he fled.
The incident - which happened after the coffee house had closed for the day - was the third armed robbery in Keighley in a fortnight.
Sergeant Allan Gee said: "Fortunately none of the staff was physically injured but it was a very frightening and traumatic incident for them.
"We are looking at any possible links between the armed robberies but we are keeping an open mind and at this stage."
Sunday's attacker is described as white, aged between 30 and 40, 6ft tall, well built but not fat, with short dark brown hair and facial stubble. He was wearing a light green thigh-length Gortex-type raincoat, and his voice was described as fairly deep.
Anyone who saw anything suspicious or has information about the incident is asked to contact Keighley CID on 01535 617085 or Crimestoppers on 0800 555 111.
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