Reuters - A Ukrainian airliner that crashed shortly after take-off from Tehran on Wednesday, killing all 176 people on board, was on fire immediately prior to the incident, according to an initial report by investigators.

The report, by Iran�s civil aviation organisation, cited witnesses on the ground and in a passing aircraft flying at high altitude as saying the jet was on fire while still aloft.

Writing by Alexander Cornwell; Editing by Clarence Fernandez