Demonstrators in the Greek city of Thessaloniki fired fireworks and flares at police on Thursday night after marches on the 10th anniversary of the fatal police shooting of a teenager turned violent.

Police responded with stun grenades and tear gas.

Alexandros Grigoropoulos was 15 when he was shot dead during a night out with friends in central Athens on December 6, 2008.

He was killed when a policeman fired his gun after an altercation.

The policeman said later that Grigoropoulos was killed by a ricochet.

The teenager's death sparked the largest riots Greece had seen in decades

Warzone at night at Thessaloniki. Masked protesters hurl firebombs and set on fire a metro construction site at city centre which was heavily damaged by the flames. Fireworks and flares responded by police with stun grenades and teargas. One person was arrested. Rioters have captured the building Theology Faculty of Thessaloniki University from which they unleashed their attacks