Anger at the austerity measures being imposed in Greece has brought scuffles between police and protesters in Athens.
The demonstration was mostly peaceful but there was some trouble as thousands of teachers and students converged on parliament.
The protesters are furious at tax and price rises, pay freezes and pension cuts being brought in.
There has been concern abroad at whether the Greek government’s plan will work. The euro fell again, to a new one-year low against the dollar, and there are fears the crisis could still spread to other countries.
Public sector workers are on a 48 hour strike; tomorrow a general strike is planned which is likely to shut down services across the country.
Dozens of communist protesters called for Europe-wide protests against the Greek government’s plan. Earlier, at dawn, they broke into the ancient Acropolis in Athens.
The austerity measures have been put before parliament in a draft bill to be voted on by the end of the week.