Two U.S. officials said Thursday it was "highly likely" that an Iranian anti-aircraft missile downed a Ukrainian jetliner late Tuesday, killing all 176 people on board.
The crash came just a few hours after Iran launched a ballistic missile attack against Iraqi military bases housing U.S. troops amid a confrontation with Washington over the U.S. drone strike that killed an Iranian Revolutionary Guard general last week. The officials, citing U.S. intelligence, spoke on the condition of anonymity to discuss sensitive information. They said they had no certain knowledge of Iranian intent. But they said it could very well have been a mistake, and that the airliner was mistaken for a threat.
U.S. President Donald Trump suggested that he believes Iran was responsible and wouldn't directly lay the blame on Iran, but dismissed Iran's initial claim that it was a mechanical issue.
"Somebody could have made a mistake on the other side.," Trump said, noting the plane was flying in a "pretty rough neighbourhood."
"Some people say it was mechanical," Trump added. "I personally don't think that's even a question."
The U.S. officials wouldn't say what intelligence they have that points to an Iranian missile. But they acknowledged the existence of satellites and other sensors in the region, as well as the likelihood of communications intercepts and other similar intelligence.
The U.S. assessment comes after a preliminary Iranian investigative report released Thursday said the pilots never made a radio call for help and claimed the aircraft was trying to turn back for the airport when the burning plane went down. Ukraine, meanwhile, said it considered a missile strike as one of several possible theories for the crash, despite Iran's denials.
The Iranian report suggests that a sudden emergency struck the Boeing 737 operated by Ukrainian International Airlines late Tuesday, when it crashed, just minutes after taking off from Imam Khomeini International Airport in Tehran.
Investigators from Iran's Civil Aviation Organization offered no immediate explanation for the disaster, however. Iranian officials initially blamed a technical malfunction for the crash, something initially backed by Ukrainian officials before they said they wouldn't speculate amid an ongoing investigation.
The Ukrainian International Airlines took off at 6:12 a.m. Wednesday, Tehran time, after nearly an hour's delay at Tehran's Imam Khomeini Airport, the main airport for travellers in Iran. It gained altitude heading west, reaching nearly 8,000 feet, according to both the report and flight-tracking data.
Then something went wrong, though "no radio messages were received from the pilot regarding unusual situations," the report said. In emergencies, pilots reach out to air-traffic controllers to warn them and to clear the runway for their arrival, though their first priority is to keep the aircraft flying.
Eyewitnesses, including the crew of another flight passing above it, described seeing the plane engulfed in flames before crashing at 6:18 a.m., the report said. Flight-tracking data for the plane stopped before the crash, which occurred in the town of Shahedshahr to the northeast of the plane's last reported position. That's the wrong direction of the flight plan, bolstering the report's claim that the pilots tried to turn the aircraft back to the airport.
--With files from CTV News--