Greek public sector workers, who are bearing the brunt of wage and pension cuts as part of Greece's austerity programme, have begun a 48-hour strike.
Their action comes ahead of a nationwide general strike on Wednesday.
The programme has been introduced in return for a 110bn euro (£95bn) world rescue package agreed for the country.
Some protesters breached security at Greek landmark the Acropolis, and unfurled banners.
Sally Eden reports.
BBC NEWS CHANNEL
~RS~a~RS~Domestic~RS~q~RS~~RS~z~RS~38~RS~){kind=small}
~RS~q~RS~~RS~z~RS~38~RS~)
Bookmark with:
What are these?
E-mail this to a friend