RABAT: Morocco's King Mohammed VI slammed both the "odious" killing of the US ambassador to Libya and the film that has provoked anti-American attacks, in a telephone call with US Secretary of State Hillary Clinton on Sunday.

The palace said in a statement that Mohammed expressed "sincere condolences" over Tuesday's killing of ambassador Chris Stevens and three other Americans in an "odious" attack on the US consulate in the Libyan city of Benghazi.

But he also condemned "the inadmissible provocation against the sacred values of the Muslim religion," in the statement carried by the Moroccan news agency MAP.

Hundreds of Salafists on Friday burned US flags in Sale, twin town of the Moroccan capital Rabat, in protest over the US-made film that mocks Islam and has sparked unrest in several Muslim countries.

And between 300 and 400 Muslim activists gathered outside the US consulate in Morocco's largest city Casablanca last Wednesday, amid a heavy police presence, protesting against the film and shouting anti-US slogans.