Iranian media and accounts broadcast video clips of university students and citizens who gathered in the center of the capital, Tehran, to demand the dismissal of all officials who caused the accident in the Ukrainian plane crash, at a time when Iranian officials apologized for the incident that killed 176 people, including Canadians, Ukrainians and others from foreigners, as well as About eighty Iranians.

The protesters - who gathered near Amir Kabir University in the center of the capital - raised banners and chanted slogans denouncing the government policy and the way officials deal with the incident and their delay in announcing the truth and the circumstances of what happened.

Reuters reported that its semi-official Iranian counterpart, "Fars News", spoke in a "rare report" of anti-government protests after the Revolutionary Guards acknowledged the downing of the Ukrainian passenger plane.

According to the report of the Iranian Agency, the street protesters - whose numbers were estimated at about seven thousand to one thousand people - also tore pictures of Qassem Soleimani, commander of the Qods Force, of the Revolutionary Guards, who was killed by Washington in a strike plane.

After the angry demonstration launched anti-regime slogans, the Special Police Forces intervened and blocked the roads leading to the demonstration site, and prevented citizens from going to it, according to the Anatolia Agency.

Earlier on Saturday, a statement of the General Staff announced that a subsidiary air defense system shot down a passenger plane due to a human error, the moment it passed over a sensitive military area.

Tehran had initially denied the plane was caused by a missile, and said it had convincing evidence in this regard.

Iranian officials have apologized for what happened through their Twitter accounts.

President Hassan Rouhani described the incident as a tragedy, and said that the internal investigation of the armed forces concluded that rockets were fired as a result of a human error, causing the plane to crash and killing 176 innocent people.

"The investigation into the causes of this great tragedy and the unforgivable error will continue to be investigated," he added.

Foreign Minister Muhammad Jawad Zarif wrote that the error occurred during a period of crisis caused by the adventures of the United States (which) led to a catastrophe, "We deeply express our regret, our apologies and our condolences to our people, the families of the victims and the rest of the affected countries."

On the other hand, the office of Ukrainian President Vladimir Zelinsky confirmed that his Iranian counterpart had apologized on behalf of his country.

Zelinsky said that his country insists on the need for Tehran to admit guilt, expressing the hope that Iran will bring those responsible (for the incident) to justice, return the bodies of the victims, pay compensation and provide an official apology.