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Tight security in Athens for Angela Merkel's visit

9 October 2012 Last updated at 09:13 BST

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 BBC's Mark Lowen in Athens explains why tensions surround the visit.