Police have released an image of a man they want to trace after a series of robberies in homes and small businesses in the capital.
The incidents took place between Saturday 8 March and Thursday 13 March.
Officers said that on each occasion the man concealed his identity, was armed with a weapon and threatened violence if challenged.
The robber is believed to be the same man who pulled a knife on a grandmother in her own home on Monday.
"These robberies have been very similar in the way they have been carried out and the description of the suspect involved"
Police are following a specific line of enquiry connecting the various incidents, but are appealing for any information that will lead to the identity of the suspect.
On each occasion either property or cash was stolen, with the sums ranging into three figures.
The latest incident took place at the Scotmid in Warrender Park Road, at about 2345 GMT on Thursday.
The suspect entered the store with a weapon and forced both assistants to open two tills and hand over the contents.
A customer entered the store, and the robber threatened him with violence and forced him to remain within the premises while he took both assistants elsewhere to get more cash.
Concealed features
The customer escaped and contacted the police. He then saw the robber leave the premises and make off in a silver Ford Focus which was double-parked directly outside the shop, and drove off westwards towards Marchmont Road.
The thief was described as white, between 5ft 7ins and 5ft 10ins, 20 to 30 years old, of medium build with short dark hair, dark eyes, and dark eyebrows.
He was said to change his clothing on a regular basis and attempts to conceal his facial features using "a variety of measures".
A police spokesman said: "These robberies have been very similar in the way they have been carried out and the description of the suspect involved.
"There is every indication that the same man has carried out these robberies and we would ask the public to come forward if they have information.
"We would also ask the public to be extra vigilant in the vicinity of small businesses and if you notice anyone loitering or acting suspiciously, do not approach them, but contact police immediately."
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