"Sad news to wake up to. My thoughts are with the families and close ones of everyone on board Ukraine International Airlines Flight 752," the president wrote, via social media.

Sad news to wake up to. My thoughts are with the families and close ones of everyone on board Ukraine International Airlines Flight 752. #PS752

— Kersti Kaljulaid (@KerstiKaljulaid) January 8, 2020

"I am deeply saddened by the tragic news of the Ukrainian International Airlines' passenger plane crash outside Tehran," Jüri Ratas wrote on his social media account.

"My heartfelt condolences to the families and friends of the victims."

The plane, a Boeing 737 bound for Kyiv, crashed shortly after takeoff from Imam Khomeini  Airport, carrying 167 passengers and nine crew. There were no survivors.

I am deeply saddened by the tragic news of the Ukrainian International Airlines' passenger plane crash outside Tehran. My heartfelt condolences to the families and friends of the victims.

— Jüri Ratas (@ratasjuri) January 8, 2020

The exact cause of the crash and whether it was related to the current U.S.-Iran confrontation following the missile attack which killed General Qasem Soleimani in Iraq last week, and subsequent retaliatory Iranian missile attacks on U.S. military bases in Iraq, is still not known.

Ukrainian President Volodymyr Zelensky has also offered his condolences, and says the Ukraininan Embassy in Tehran is working towards establishing who was on the plane and the causes of the disaster.

Foreign minister Urmas Reinsalu (Isamaa) also issued his condolences on the plane crash via his social media account Wednesday morning.

My deepest condolences to the victims and their loved ones of the Ukrainian plane #PS752 crash near #Tehran last night.

— Urmas Reinsalu (@UrmasReinsalu) January 8, 2020

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