Two young boys pushed a wheelchair user onto a busy road before running off and leaving him there.
Andrew Harding, 72, who has cerebral palsy, was approached by the boys who switched off his electric wheelchair.
They then pushed him onto Dundee Street, close to Edinburgh's Fountainpark leisure complex.
The incident happened at 1615 BST on Wednesday. The suspects are said to be about nine or 10 years old.
Members of the public who saw what had happened helped the victim get back onto the pavement.
The boys were described as being white and wearing jeans and t-shirts.
A police spokesman said: "Officers are keen to speak to anyone who was in the area and witnessed the incident to come forward.
"What these boys did was not only extremely cruel and insensitive, but incredibly dangerous."