The film which Muslims say defames Prophet Muhammad has already sparked violent clashes in Egypt, Libya, Yemen, Sudan, Tunisia, Belgium and France.
Some reports said that the video was posted by a filmmaker called Sam Bacile, who claimed that he was an Israeli Jew residing in California.
There was much doubt on whether Bacile was a real person.
Further investigation helped the police to track down a Coptic Christian called Nakula Basili, a fraudster and who was involved in the film.
Hundreds of Afghan students took to the streets of Kabul on Sunday in protest against a scandalous film, “The Innocence of the Muslims”, excerpts from which had been shown on YouTube earlier this week.
The students barricaded streets adjoining Kabul University. The above film sparked anger among Muslims across the world. There have been fierce protests in Egypt and Yemen, and also in Sudan, Tunisia, Pakistan and Bangladesh.
Protesters in the Libyan city of Benghazi attacked the U.S. consulate, killing four Americans, including U.S. ambassador Christopher Stevens.
The U.S. has called in for questioning one of the reported creators of the controversial film, Innocence of Muslims, Nakoula Basseley Nakoula.
The police claim that the questioning will not be about the film, as they do not infringe on the right to freedom of speech.
The authorities are concerned about something else: two years ago, the man in question was convicted of fraud and was sentenced to a two-year prison term and was released early.
Conditions granting Mr. Nakoula early release prohibit him from using the Internet and from doing anything on the net under a pseudonym.
The film which has enraged Muslims worldwide was posted on the Internet and Nakoula himself appeared in the credits as Sam Becil.
The police say that for such an egregious violation he may go back to prison.
The United States has ordered non-essential diplomatic personnel to leave Tunisia and Sudan.
In a statement, the State Department also urged US citizens in Tunisia to make their way out of the country.
The US embassies in the Tunisian and Sudanese capitals have both been attacked in the wave of anti-US protests in the Muslim world over an anti-Islam film made in the US.
Earlier, Sudan refused to allow the US to send Marines to protect its embassy.
The State Department said that it was warning US citizens against all travel to Tunisia, and that it had ordered "all non-emergency government personnel from Tunisia" following the attack.
In Sudan, it said citizens should "avoid all travel to the Darfur region of Sudan, the Blue Nile and Southern Kordofan States" and to carefully considers risks in travelling to other areas.
RIA, Vesti.ru, RIA, TASS, BBC