E-FITS have now been released of two men wanted in connection with the racial attack which left a 15 year-old boy in hospital after he was kicked repeatedly.
The incident happened as the victim got off a bus after school in Central Avenue in Hayes on Friday, May 16 between 4.30pm and 5pm.
The teenager now requires facial surgery after being kicked in the face and head.
Detective Sergeant Stephen Murphy, said: "This is an isolated incident. The attack was unprovoked and has left the victim with serious injuries.
"It happened during daylight hours on a busy main road and there must be people who have driven past or were in the area at the time.
"We are very keen to identify the two suspects and are appealing for witnesses who have information."
The first male is described as white, 5ft 10, of large build and is about 20 years-old with short ginger hair and acne around the forehead and mouth.
He was wearing a black puffer jacket and grey track suit bottom.
The second male is described as being of slim build, 6ft 2, and is about 18-years-old and was wearing a light blue casual top with Mackenzie label in the front and blue jeans.
* Anyone with information should contact Mr Murphy on 0208 246 1447 or, Crimestoppers on 0800 555 111.