The Muslim community in Trois Rivieres is shaken after three racist posters were taped to the front door of a mosque last weekend. One of the signs read in French: "Arab terrorists, get out." Another showed one of the cartoons of the Prophet Muhammad published in a Danish newspaper last fall that caused an international furor. The third called for young Quebecers to stand up against the "Islamization" of Quebec cities. The posters were signed Quebec Radical, described in news reports as an underground, extreme-right, anti-immigration group. About 300 Muslims live in Trois Rivieres.