British Prime Minister Boris Johnson called Thursday for a "full, credible and transparent" investigation into how a Ukrainian passenger plane crashed in Iran, killing all 176 people on board.
A spokesman said reports about what happened were "very concerning", after a Ukrainian security official said investigators were pursuing several leads, including the possibility of a surface-to-air missile strike.
Johnson spoke to Ukrainian President Volodymyr Zelensky in a phone call in which he offered his condolences for the loss of life and received an update on Ukraine's efforts to establish the facts, the spokesman said.
"The prime minister said that there needed to be a full, credible and transparent investigation into what happened," the spokesman said.
He added: "The reports we have seen are very concerning and we are urgently looking into them."
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