Police in Scarborough are investigating the armed robbery at the One Stop shop on North Leas Avenue at around 11pm on Sunday..
A male shop worker suffered a cut lip after being punched. He attended Scarborough Hospital for treatment.
Police inquiries are continuing today to establish the full circumstances surrounding the incident, including a full forensic examination at the scene.
The suspects, who had their faces covered with hooded tops, ran off with cash in the direction of Maple Drive.
One of the suspects waited outside the shop while the other two went inside.
It is believed a man wearing a grey tracksuit top and dark bottoms made threats with a knife before assaulting the shop worker.
The other man in the shop was wearing dark clothing and made threats with an axe-like weapon.
Detective Sergeant Andy Dudman, of the Scarborough Serious Crime Team, said: “This is a shocking incident and we are doing all we can to track down the suspects and support the victims.
“We are appealing for any witnesses to come forward as soon as possible to help the investigation. We also need any information about suspicious behaviour in the vicinity of the One Stop shop on North Leas Road on Sunday evening to get in touch without delay.”
If you can help, call North Yorkshire Police on 101, select option 2, and ask for the Scarborough Serious Crime Team.