A handout picture provided by the office of Iran's Supreme Leader Ayatollah Ali Khamenei on January 1, 2020 shows him delivering a speech during a gathering in the capital Tehran.
"I and the government and the nation of Iran strongly condemn this American crime," Ayatollah Ali Khamenei said in a speech broadcast on state television.
They were his first remarks since Sunday's deadly US strikes on the Hashed al-Shaabi paramilitary network in western Iraq.
The United States carried out the raids in retaliation for rocket fire that killed an American civilian contractor at a base in northern Iraq on Friday.
In a tweet on Tuesday, Trump accused Iran of "orchestrating" that day's storming of the US embassy in Baghdad by protesters angry at the American air strikes.
Iran killed an American contractor, wounding many. We strongly responded, and always will. Now Iran is orchestrating an attack on the U.S. Embassy in Iraq. They will be held fully responsible. In addition, we expect Iraq to use its forces to protect the Embassy, and so notified!
— Donald J. Trump (@realDonaldTrump) December 31, 2019
Trump said: "Iran will be held fully responsible for lives lost, or damage incurred, at any of our facilities. They will pay a very BIG PRICE! This is not a Warning, it is a Threat."
In response, Khamenei retweeted the post and said: "That guy has tweeted that we (the United States) see Iran responsible for the events in Baghdad and we will respond to Iran.
US sanctions against Iran are a 'reckless addiction': Zarif
"First of all, you can't do a damn thing! This has nothing to do with Iran," the supreme leader in his televised address.
"Secondly, be logical... The people of this region hate America. Why don't Americans understand this?" he said.
"You Americans have committed crimes in Iraq, you have committed crimes in Afghanistan. You have killed people."
Khamenei said Iran was ready to respond to any threat.
"If the Islamic republic decides to oppose or fight against a country, it will do this explicitly," he said.
"We are strongly committed to the interests of our country... We are strongly committed to the dignity of our nation. We are strongly committed to the progress and greatness of the nation of Iran.
"Should anyone threaten these, we will confront him without any hesitation and will strike our blow," Khamenei said.
"We will never... drag the country towards war. But if others want to impose anything on this country, we will stand against them with all our might."
US-Iran tensions have soared since Washington pulled out of a landmark nuclear agreement with Tehran in 2018 and reimposed crippling sanctions.
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