Jan. 11 (UPI) -- Iranian protesters took to the streets Saturday to demand the resignation of the country's leader, Ayatollah Ali Khameni, after learning the country had shot down a Ukrainian airliner, killing 176 people.
Hundreds of people gathered in front of Tehran's Amir Kabir University on Saturday chanting, "Commander-in-chief [Khamenei] resign, resign" and denouncing officials as liars.
President Donald Trump tweeted messages in English and Persian in support of the protesters.
Iran said Saturday that it unintentionally shot down a Ukrainian civilian plane shortly after takeoff, killing all 176 aboard in a missile attack caused by "human error."
The incident occurred hours after the country launched ballistic missiles at Iraqi bases hosting U.S. troops.
"Armed Forces' internal investigation has concluded that regrettably missiles fired due to human error caused the horrific crash of the Ukrainian plane and death of 176 innocent people," Iranian President Hassan Rouhani tweeted. "Investigations continue to identify and prosecute this great tragedy and unforgivable mistake."
Brig. Gen. Amir-Ali Hajizadeh said in a news conference that an air defense operator misidentified the plane as a cruise missile, admitting the mistake after authorities in Iran Friday rejected U.S. intelligence officials suspicions that an Iranian missile had shot down the Ukrainian jetliner.
Trump's warning that he could target 52 Iranian sites, including ones that were "culturally important," also placed Iran on high alert as tensions were rising, Hajizadeh added.
Once it became clear what happened, Hajizadeh said he thought "I wish I was dead."
Iranian Foreign Minister Mohammed Javad Zarif partly blamed "U.S. adventurism" for the crash.
Based on preliminary conclusions of the investigation, "human error at time of crisis caused by U.S. adventurism led to disaster," Zarif tweeted. "Our profound apologies and condolences to our people, to the families of all victims, and to other affected nations."
In light of Trump threatening to target the 52 sites in Iran, Iran's president appeared to make reference to a 1988 incident in which a U.S. Navy guided-missile cruiser mistakenly shot down an Iranian passenger plane, Iran Air Flight 655, killing all 290 aboard.
"Those who refer to the number 52 should also remember the number 290," Rouhani tweeted. "Never threaten the Iranian nation."