ATHENS — A wave of violent attacks against immigrants by suspected right-wing extremists has put Muslims and the police on alert in rundown parts of Athens with burgeoning migrant populations.

Immigrants have been beaten and stabbed near central squares, and several makeshift mosques have been burned and vandalized. In the most grievous attack, at the end of October, the assailants locked the door of a basement prayer site and hurled firebombs through the windows, seriously wounding four worshipers.

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