A Ukrainian Boeing-737 with more than 170 people on board has crashed in Iran, officials say.
Iran's Red Crescent said there was no chance of finding survivors.
The Ukraine International Airlines plane crashed just after take-off from Iran's Imam Khomeini airport in Tehran, said the Fars state news agency.
The plane was flying to the Ukrainian capital Kyiv. Ukraine's government said a crisis group was being set up to investigate the crash.
President Volodymyr Zelensky was cutting short a trip to Oman and returning to Kyiv, a statement said.
"My sincere condolences to the relatives and friends of all passengers and crew," he said in a statement.