Turkish police halt May Day rally
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The clash came amid a political crisis in Turkey
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Turkish police have arrested at least 80 left-wing demonstrators who were trying to hold a May Day rally in the commercial capital Istanbul.
Police fired tear gas and used batons to prevent the rally taking place on Taksim Square.
The authorities sealed off several roads in central Istanbul.
Trade unionists wanted to commemorate victims of an attack on May Day 1977, when gunmen opened fire on peaceful demonstrators. More than 30 died then.
Police on Tuesday allowed only a handful of trade union leaders to lay red carnations in memory of those who died in 1977.
Police also stopped television crews setting up satellite dishes in the square, although one channel filmed events from a nearby building.
clipped from: news.bbc.co.uk 
Istanbul clashes