ATHENS, Greece — More than 20,000 protesters marched through Athens to parliament Thursday as unions challenged Greece’s painful austerity measures with their fourth general strike this year.
Two separate rallies ended peacefully, but city officials and shopkeepers had taken extensive precautions in case the protests turned violent, like one two weeks ago in which a bank was set afire, killing three people inside.
Store owners closed up and lowered protective shutters before the march got under way, and police deployed 1,700 officers and detained 36 people in an early show of force.
Demonstrators outside the parliament building banged pots and pans and shouted "Thieves, thieves!” but did not attempt to breach a cordon of riot police holding them back.
The strike closed schools, halted ferries and trains, and kept hospitals running with only emergency staff. The Acropolis and other ancient sites in Athens were also shut.
Three cruise ships carrying a total of 7,280 passengers were prevented from using Greece’s main port of Piraeus because tug boat crews were on strike, the coast guard said. The ships picked alternative ports, with one docking at Nafplion south of Athens, another on the island of Mykonos and the third heading straight to Turkey.
Premier George Papandreou, visiting Lebanon, said he sympathized with many of the protesters.
"The Greek people are understandably voicing their views about the economic crisis, and it is painful,” Papandreou said. "We understand this and I understand this myself. We also know that we must move ahead with these changes in order to make the country with a viable economy, a competitive economy.”
Unions are protesting steep cuts imposed by the cash-strapped government.
Protesters observed a minute of silence for the three victims before the march, which ended peacefully.
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The only tension came after the march was over, when a group of about 20 mainly young protesters sat in the middle of a major avenue in front of Parliament and refused to budge.
Public anger has grown at deep pension and salary cuts, as well as steep tax hikes, imposed in an attempt to pull Greece out of an unprecedented debt crisis. The measures were needed for Greece to receive a euro110 billion ($134.97 billion) three-year rescue loan package from other EU countries and the International Monetary Fund that staved off bankruptcy.
Ilias Iliopoulos, general secretary of Greece’s public servants’ union, Adedi, said low-income workers were being burdened unfairly.
"Let the government hear this message very clearly: We are not retreating from our demands, and we will continue our struggle until we have won,” Iliopoulos said.
Earlier, members of a communist-backed labor union occupied the Labor Ministry and held a separate peaceful rally.
Unlike in other general walkouts, most flights were unaffected as air traffic controllers stayed on the job. Some small regional airports closed, and Greece’s Olympic Air carrier said it was canceling 30 domestic flights.
The country’s debt crisis has sent shock waves through global markets. That, combined with fears for Europe’s struggling economy and German warnings that the future of the euro is at stake, sent the common currency to a four-year low against the dollar Wednesday.
Warding off bankruptcy, Greece repaid 10-year state bonds worth euro8.5 billion ($10.43 billion) Wednesday after receiving the rescue loans.
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Associated Press writers Nicholas Paphitis and Derek Gatopoulos, and AP television producer Theodora Tongas contributed to this report.

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