DUBAI (REUTERS) - A Ukrainian airliner was on fire immediately before it crashed south-west of Teheran, killing all 176 on board, according to an initial report by Iranian investigators.
The Ukrainian International Airlines Boeing 737-800, flying to Kiev and carrying mostly Iranians and Iranian-Canadians, crashed shortly after taking off on Wednesday (Jan 8) from Teheran's Imam Khomeini airport.
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.
The three-year-old Boeing jet, which had its last scheduled maintenance on Jan 6, encountered a technical problem shortly after take-off and started to head towards a nearby airport before it crashed, the report said.
The technical problem was not specified in the report.
However, a Canadian security source told Reuters there was evidence one of the jet's engines overheated.
The crash occurred hours after Iran launched missile attacks on US-led forces in Iraq, leading some to speculate that the plane may have been hit.
Five security sources - three Americans, one European and the Canadian - who asked not to be named, told Reuters the initial assessment of Western intelligence agencies was that the plane had suffered a technical malfunction and had not been brought down by a missile.
In Kiev, Ukraine's President Volodymyr Zelensky said the government was considering several possible causes of the plane crash.
In a television statement, Mr Zelensky asked people to refrain from speculation, conspiracy theories and hasty evaluations regarding the crash. He also declared Thursday a day of national mourning.
He said that he would speak by telephone with the Iranian president to step up cooperation into the reason for the crash.