Washington, USA
The US government believes Iran accidentally shot down a Ukraine airliner that crashed in Iran, killing all 176 people aboard, officials say.
Citing an extensive review of satellite data, one US official told Reuters news agency the government had concluded with a high degree of certainty that Iranian anti-aircraft missiles brought down the plane.
Officials said the plane had been tracked by Iranian radar before the missiles were fired.
The data showed the Ukrainian International Airlines Boeing 737-800 bound for Kiev was airborne for two minutes after departing Tehran when the heat signatures of two surface-to-air missiles were detected, one of the officials said.
That was quickly followed by an explosion in the vicinity of the plane, this official said. Heat signature data then showed the plane on fire as it went down.
The three officials said Washington believed the downing of the plane was an accident. It occurred shortly after Iran had fired missiles at two US military bases in Iraq and Iranians were on high alert for a US military response.
The head of Iran's of Civil Aviation Organisation denied "illogical rumours" that a Ukrainian airliner that crashed near Tehran had been hit by a missile, the semi-official news agency ISNA reported.
"Scientifically, it is impossible that a missile hit the Ukrainian plane, and such rumours are illogical," Ali Abedzadeh said.
The reports come after Ukraine outlined four potential scenarios today to explain the deadly crash, including a missile strike and terrorism.
Iranian investigators have said the plane was on fire before it fell to the ground.
Kiev said its investigators wanted to search the site of the crash southwest of Tehran for possible debris of a Russian-made missile used by Iran's military.
An initial report by Iran's civil aviation organisation said the plane had experienced an unspecified technical problem.
The Ukrainian International Airlines Boeing 737-800, flying to Kiev and carrying mostly Iranians and Iranian-Canadians, crashed shortly after taking off from Tehran's Imam Khomeini airport.
The Iranian report cited witnesses on the ground and in a passing aircraft flying at a high altitude as saying the plane was on fire while in the air.
It said the three-year-old airliner, which had its last scheduled maintenance on Tuesday, encountered a technical problem shortly after take-off and started to head toward a nearby airport before it crashed. The report said there was no radio communication from the pilot and that the aircraft disappeared from radar at 8000 feet (2440m).
The disaster puts a renewed spotlight on Boeing, which faces a safety crisis over a different type of 737, though the plane that crashed in Iran does not have the feature thought to have caused crashes of the grounded 737 MAX.
The Iranian report referred to the crash as an accident.
Investigations into airliner crashes are complex, requiring regulators, experts and companies across several international jurisdictions to work together. It can take months to fully determine the cause and issuing an initial report within 24 hours is rare.
A Canadian security source told Reuters there was evidence one of the engines had overheated.
The crash happened hours after Iran launched missile attacks on US-led forces in Iraq, leading some to speculate that the plane may have been hit.
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, five security sources - three Americans, one European and the Canadian - who asked not to be named, told Reuters.
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