Below, a Youtube video of an Islamist rally at the Hague (on July 4) in which the participants chanted "Khaybar, Khaybar Ya Yahud, jaish Muhammad sayaud" - "Khaybar, Khaybar, O Jews, Mohammed’s army will return.” This refers to a battle in the oasis of Khaybar, in Arabia, between Jews and the followers of Muhammad in 629 C.E., which the Jews lost to the Muslims. They were forced to pay tribute in order to remain in the oasis, but were expelled from it several years later (see the Wikipedia article - Battle of Khaybar).
The demonstrators also chant "Allahu Akbar," "Down, down USA," "Down, down Israel," and "there is no god but God."
Notice also the black and white flags - they all have the shehadah (the Muslim declaration of faith) written on them. I also saw the same flags (only with a white background) at the Zurich anti-Israel rally I attended.