They are protesting against a proposed EU free trade deal with South America and a Polish agricultural tax.

They are protesting against a proposed EU free trade deal with South America and a Polish agricultural tax.
The Swedish firm’s factory in Gdańsk, which only opened last year, had initially been planned to be the biggest in Europe.
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Everyone, “especially seniors”, should vote “in crowds”, says the PM.
The drop in extreme poverty has been most felt in rural areas – from 9.4% to 7.5%.
Other countries on the new list include Japan, South Korea, Montenegro, Georgia and Albania.
Costs are pushed up by domestic holiday-goers and “coronavirus” fees on services.
Around half of overseas voters favoured Trzaskowski in the first round.
Other parts of the country have also been hit by heavy rains.
The decision comes a week after a controversial speech at the shrine by a deputy prime minister.
A report finds the vote was professionally administered but with a number of problems.
Poland looks to be heading for a second round on 12 July.
The Bishop of Kalisz, Edward Janiak, is being investigated by the Vatican.
Teaching is expected to return to normal, with some complementary remote work.
The head of the union warns that the main opposition candidate is a “hardened liberal” who would roll back workers’ rights.