Police clashed with demonstrators in central Athens on Friday night as thousands attended rallies to mark the fifth anniversary of a fatal police shooting of a teenager - a killing that triggered major riots in Greek cities for three weeks. Police said four officers were injured in the clashes on Friday, 10 people were arrested for causing public disturbances and 55 people were detained for questioning. Police used tear gas, pepper spray and stun grenades in a bid to quell the rioters.

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