A senior Trump administration official said Iran made a mistake when it accidentally shot a Ukrainian plane and called it "reckless action".

"Iran has finally made a terrible mistake. Their reckless action has once again caused devastating consequences," the senior official, who spoke on condition of anonymity in the administration of US President Donald Trump, said today.

This is considered Washington's first reaction since Iran admitted to accidentally downing a passenger plane of Ukraine International Airlines (UIA), killing 176 people on board.

The White House and the State Department have yet to comment on the incident.

Iranian President Hassan Rouhani called the incident "an unforgivable great tragedy", promising to prosecute those responsible. Iranian Foreign Minister Javad Zarif also expressed "deeply regret" and apologized to the people of Iran, the families of the victims and the affected countries.

General Amirali Hajizadeh, commander of the Iranian Revolutionary Guards (IRGC), said the air defense complex had misidentified its target and shot down the plane due to stress. US escalation.

Ukraine and Canada, the second-most deadly nation in the incident, called for a comprehensive and transparent investigation to bring justice to the victims.