Armed robbers momentarily locked themselves in an office during a violent raid at a Manchester supermarket.
At about 9.45am on Monday 3 February 2014, four robbers targeted Royal Mail staff making a cash delivery at Aldi on Lloyd Street South, Moss Side.
The gang, who were armed with weapons including a machete and sledgehammer, entered the store.
They demanded cash and forced staff into an office off the shop floor.
Having caused damage to the inside door handle, the offenders were momentarily unable to escape.
Following unsuccessful attempts to smash a window and escape, they managed to put part of the handle back in the door before running off empty handed through the shop.
They escaped in a white BMW One series, registration MT62 KKE, that had been stolen from an address in Cheetham Hill on the evening of 1 February 2014.
During the raid a security guard who was making the cash delivery was hit across his back and shoulder by an offender with a sledgehammer. He has been taken to hospital for treatment to his injuries.
The four offenders were all white men and were wearing balaclavas. They were armed with a machete and sledgehammer.
Detective Sergeant Doug Cowan, said: “The robbers have used unnecessary levels of violence and intimidation during the raid.
“Various staff members have been threatened and some people injured, one quite seriously having been hit with a sledgehammer.
“None of the victims offered any resistance, making this attack all the more unwarranted and brutal.
“At one point they have locked themselves inside the store and attempted to smash their way out, only to manage to briefly repair the door and escape, proving that these men are at ease terrifying and attacking innocent people and using whatever force necessary in pursuit of their aims.
“If you saw what happened or know anything about those responsible please contact us in complete confidence.
“I also want to hear from anyone with information about the car involved. It was stolen on Saturday night so must have been kept somewhere until it was used in the robbery.
“Have you seen a white BMW One series somewhere that appeared out of place or suspicious?
“If so, we want to hear from you.”
Anyone with information is asked to call police on 0161 856 6104, or Crimestoppers, anonymously, on 0800 555 111.