Greeks protest over teenage killing

Thousands of protesters have attacked banks and shops in Athens and Greece\'s northern city of Thessaloniki, angered by the police\'s killing of a teenager.



Demonstrators threw petrol bombs, rocks and other objects at the buildings and at police, who responded with tear gas.



In Athens, many protesters have taken refuge in the Polytechnic University, protected by law from police intrusion.



The city centre is still strewn with glass after riots overnight triggered by the shooting in the Exarchia area.



Police said the first day of riots had left 24 police officers injured, one seriously, and 31 shops, nine banks and 25 cars damaged or burned.



Six people were arrested, one of them for carrying a weapon.