A march marking the ninth anniversary since 15-year-old Alexis Grigoropoulos was shot dead by a police officer in 2008 began in the centre of Athens on Wednesday evening.

Among those marching were members of anti-establishment and leftist groups that gathered outside the Athens university building (Propylaea) on Panepistimiou Street, shouting slogans against the police and heading toward Syntagma Square, opposite Parliament.

Traffic has been interrupted on Panepistimiou and Stadiou Streets while the march is underway.

An earlier march by students and high-school pupils in Athens on Wednesday was marred by violent incidents by groups of unidentified individuals.