Anarchists occupied Greece's ruling party headquarters on Sunday in support of hunger strikers protesting against conditions in the country's maximum-security jails.

The anarchists hung banners from the building's balconies calling for the abolition of the controversial C-type jails, where the country's most notorious criminals and terrorists are held.

Activists claim prisoners are subjected to an unnecessarily harsh regime and allowed no contact with their families.

The protesters also demanded the release of Savvas Xeros, the bomb-maker of the extreme left-wing 17 November terrorist group, who is serving life in prison and is in ill health.