A plane that crashed in Iran with 176 people on board was trying to return to the airport when it crashed, Iranian investigators have said.
The Boeing 737-800 went down just minutes after taking off from Tehran’s airport, leaving no survivors.
An initial probe found the aircraft experienced a problem as it was leaving the airport zone, and was “on fire”.
Earlier, Iran said it would not hand over the recovered black box flight recorders to Boeing or to the US.
Under global aviation rules Iran has the right to lead the investigation, but manufacturers are typically involved.
The crash came at a time of high tensions between Iran and the US – just hours after Iran carried out missile strikes on two air bases housing US forces in Iraq. However there is no evidence the two events are linked.
There was no distress call
Iran’s Civil Aviation Organisation CAOI chief Ali Abedzadeh said: “The plane, which was initially headed west to leave the airport zone, turned right following a problem and was headed back to the airport at the moment of the crash.”
Mr Abedzadeh added that witnesses saw the plane “on fire” before the crash, and that pilots hadn’t made any distress calls before trying to return to Imam Khomeini airport.
He said the initial findings had been sent to Ukraine and the US, where Boeing is headquartered. Sweden and Canada had also been sent the findings, as their nationals were on board, he added.
Ukraine has declared January 9 a day of national mourning.
The Ukraine International Airlines flight PS752 to Kyiv had 176 people on board when it crashed in Iran on Wednesday.
The majority of passengers were from Iran and Canada.
Ukraine’s Tehran embassy initially blamed engine failure but later removed the statement, saying any comment regarding the cause of the accident prior to a commission’s inquiry was not official.
There was good visibility when the plane went down near Iran’s capital, according to the Flightradar24 aviation website. Officials from the airline said the crew were experienced.
President Zelensky warned against “speculation or unchecked theories regarding the catastrophe” until official reports were ready.
Mr Abedzadeh said “terrorism” had played no role in the crash, according to Mehr.
Among the victims were 82 Iranians, 63 Canadians, 11 Ukrainians including all nine crew, 10 Swedes, four Afghans, three Britons and three Germans, Ukrainian Foreign Minister Vadym Prystaiko said. Fifteen of the dead were children.
But the German government later said “we currently have no knowledge that German citizens are among the victims of the plane crash in Iran”.
Iran’s head of emergency operations said 147 of the victims were Iranian. That would suggest that 65 of the foreign nationals had dual nationalities. The Ukrainian airline gave a helpline number for further information about passengers: +38-044-581-50-19.
Mr Trudeau said 138 passengers on the flight were en route to Canada via Kyiv.
“All people who won’t be coming home to their parents, their friends, their colleagues or their family,” he said. “All had so much potential, so much life ahead of them”.