No one was injured in the attack but staff have been left “shaken”, police say.
Detective Sergeant John Seaton, of Greater Manchester Police’s Trafford District, said: “This was a shocking attack on people who were just doing their jobs
No arrests have yet been made but enquiries are on going.
Officers have also released an image of a man they want to speak to in connection with the armed robbery.
DS Seaton added: “We are appealing to members of the public to assist us in identifying the man in the image we have released as we want to speak to him in connection with the incident.”
Anyone with information should call police on 0161 856 7527 or 0161 856 7842, quoting incident number 3445 of 24/10/2019, or Crimestoppers, anonymously, on 0800 555 111…