There is tight security in Athens ahead of a visit by German Chancellor Angela Merkel, her first since the eurozone crisis erupted nearly three years ago.
Some 7,000 police officers are on duty, public gatherings are banned in certain areas of the city and protesters have been warned to "protect the peace".
The visit comes as Greece bids to pass new cuts of 13bn euros (£10.5bn; $17bn) to qualify for more bailout cash.
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