Amid jubilant celebration over Osama bin Laden's death in America, Muslim extremists in the Middle East are mourning his death and calling for revenge against the US.

These people are not shy about their support - they have held rallies, protests, and even burned American flags.

They hail bin Laden as a hero, martyr, and a defender of Islam. They have called America's killing of him a heartless execution. Below are pictures of these extremists from all over the Muslim world.