BBC News:- A Ukrainian Boeing-737 carrying 176 people has crashed in Iran and officials say there is no chance of finding survivors.
Ukraine International Airlines flight PS752 to Kyiv went down after taking off from Imam Khomeini airport in Tehran at 06:12 local time (02:42 GMT).
The majority of passengers were from Iran and Canada.
Ukraine’s Tehran embassy initially blamed engine failure but later removed the statement.
It said any comment regarding the cause of the accident prior to a commission’s inquiry was not official.
Hours before the plane came down Iran carried out a ballistic missile attack on two air bases housing US forces in Iraq. There is no evidence that the two incidents were linked.
Ukraine’s president, Volodymyr Zelensky, warned against “speculation or unchecked theories regarding the catastrophe” until official reports were ready.
Iranian media blamed technical problems and quoted an aviation official who said no emergency had been declared.
In a sign of the potential difficulties facing crash investigators, the head of Iran’s civil aviation organisation was quoted as saying the Ukrainian plane’s black box would not be handed over, either to Boeing or the Americans.
Ali Abedzadeh said “terrorism” had played no role in the crash, Iran’s conservative Mehr news agency reported. Another official, Qasem Biniaz, blamed an engine fire. “Had the accident happened due to a missile strike, the plane would have exploded in the air,” he told the IRNA news agency.