Men in black shirts attacked protesters in central Beirut on Tuesday, destroying their camp in the square as some people ran shouting for help from security forces, according to a Reuters witness.
The men were believed to be supporters of the Lebanese groups Hezbollah and Amal.
Earlier, supporters of the two Shi'ite movements fought with protesters at a roadblock and in another part of central Beirut, leading police to step in, Reuters witnesses said.
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