Greeks also protested in Paris, Berlin, London, Rome, The Hague, Moscow, New York, Italy and Cyprus. In Madrid and Barcelona, youths attacked a police station and a bank on Wednesday night following protests over the Greek teenager's death, Spanish police said.
While the Greek government, which has a one-seat majority in parliament, appeared to have weathered the immediate storm, its hands-off response to the rioting will damage its already low popularity ratings, pollsters said. The opposition socialist party, which leads in the polls, has called for an election.
"The most likely scenario now is that Karamanlis will call elections in two or three months' time," Georges Prevelakis, professor of geopolitics at Sorbonne University in Paris, said.
On Wednesday, foreign and domestic flights were grounded, banks and schools were shut, and hospitals ran on emergency services as hundreds of thousands of Greeks walked off the job.
Unions say privatizations, tax rises and pension reform have worsened conditions, especially for the fifth of Greeks who live below the poverty line, just as the global downturn is hurting the 240 billion-euro ($315 billion) economy.
The Greek Commerce Confederation said damage to businesses in Athens alone was worth about 200 million euros, with 565 shops seriously damaged.
In a televised message, Karamanlis, who swept to power during the euphoria of the 2004 Athens Olympics, announced subsidies, loans and tax relief measures for those affected.
In four years of conservative rule, a series of scandals, devastating forest fires, and unsuccessful economic measures have erased the optimistic mood of 2004.
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