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By Karin Strohecker and Marton Dunai VIENNA/BUDAPEST (Reuters) - Trains carrying hundreds of migrants started arriving in Vienna on Monday after Austrian authorities appeared to give up trying to apply European Union rules by filtering out refugees who had already claimed asylum in Hungary. In the latest twist in a humanitarian and political crisis that is now testing the survival of both Europe's open-border regime and its asylum rules, Hungary allowed the migrants, many of them fleeing Syria's civil war, to cram into at least four trains leaving Budapest for Austria or Germany.
Europe's main stock markets slid Monday as investors still rattled by last week's turmoil pondered China's slowing economy and potential US interest rate moves. London's stock exchange was closed for a national holiday. The DAX fell by 9.3 percent over the month, the CAC dropped by 8.5 percent and the FTSE 100 in London shed 6.7 percent.