Police are investigating two robberies on the same Salford road in just over 24 hours.
The first incident happened at the Spar, on Seaford Road, Pendleton, at around 9.30pm on Saturday 4 January 2014.
A masked man entered the store, produced a machete from his trousers and threatened staff with it.
He forced them to open the till and he escaped with a quantity of cash. No-one was hurt.
The second robbery happened at about 8.20pm on Sunday 5 January 2014, at Subway, also on Seaford Road.
A lone, masked robber walked into the store and vaulted the counter, confronting a member of staff.
He then threatened them and ordered them to open the tills. He then rifled through the till, stole a quantity of cash and ran off in the direction of Coniston Street and out of sight.
This staff and customer in the store were clearly very shaken by the incident.
The Spar robber is described as white, in his early 20s with a stocky build, around 5ft 8in tall. He was wearing a grey tracksuit top with hood up and grey tracksuit bottoms, with a black mask covering his face. He was also wearing black gloves.
The man who robbed the Subway was described as 6ft tall, wearing dark clothing with his hood up over his head, scarf across his face and Nike trainers.
Officers are now investigating whether the two incidents are in any way connected.
Detective Constable Susan West, based at Swinton police station, said: “Thankfully no-one was injured, but staff in both stores have understandably been left very shaken.
“Shops on this stretch of road were targeted twice in 24 hours, but that doesn’t mean we can categorically say they were carried out by the same offender.
“This is one of the facts we are currently trying to establish.
“Either way, the fact someone thinks they can waltz into a shop and use a machete to threaten innocent shoppers and staff is shocking.
“This is why we are determined to catch whoever is responsible. If you saw anything, no matter how insignificant it might have seemed at the time, please get in touch. Your call could help us take this man off the streets.”
Anyone with information should call police on 0161 856 5360 or the independent charity Crimestoppers, anonymously, on 0800 555 111.