Youths smashed windows and threw rocks at police in central Athens Friday, the seventh day of clashes that erupted after a police officer killed a 15-year-old boy last Saturday.
Protesters, described as mostly students, were seen smashing the glass doors of a Citibank, throwing a metal barricade at police lined up along a street and scuffling with police wearing white helmets.
Many of the officers were wearing riot gear. One image showed a substance that looked like blood on a curb. 
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Journalist Anthee Carassava and CNN's Eileen Hsieh contributed to this report.
