A man was punched to the ground and kicked after questioning a group that were drinking in his close.
The 62-year-old went into the common stair in Ferry Road Drive at around 7.30am on Sunday.
He found a group of three men and a woman sat in the close drinking and asked them what they were doing there.
One of the men punched him in the face and the victim fell to the ground before another man started kicking him. The group then left the close.
The victim went to St John’s Hospital where he was treated for a broken jaw and reported the attack to the police on Tuesday.
Lothian and Borders Police are appealing for witnesses as they try and find the men responsible.
The first suspect is described as a white man aged around 20, around 5ft 10in tall and well built with short, fair hair. He was wearing a sweatshirt and grey jogging bottoms at the time of the attack.
The second man is also white and around 20 years old. He is around 5ft 8in tall with a slim build and dark brown or black hair.
A police spokesman said: “This was an unprovoked and vicious assault that resulted in a man suffering a painful and serious facial injury.
“Given the time of day, there may have been a number of people in the streets on their way to work and anyone who remembers seeing anything suspicious in the Ferry Road Drive area on Sunday morning is asked to contact police immediately.
“Similarly, if anyone can assist in identifying those responsible for this attack, they are also asked to get in touch.”
Anyone with any information can contact Lothian and Borders Police on 0131 311 3131, or the charity Crimestoppers on 0800 555 111.