Europe's farmers have ramped up protests against EU measures and rising prices, with roads blocked in Poland, Hungary, Spain and Belgium.
In western Poland some 1,400 tractors took part in a protest in Poznan and roads were blocked across the country.
For the fourth day in a row, tractors cut off traffic in several Spanish regions, hoping to enter cities including Toledo and Zaragoza.
The protests have galvanised farmers across the continent.
However, their grievances vary widely.
Farmers in Poland and Hungary complain that the European Union is not doing enough to halt cheap imports from Ukraine undercutting local produce. They want the EU to restore a requirement on Ukrainian truckers to obtain a permit to work across the 27 member states.
In Poland, lines of tractors, many flying the Polish flag, appeared on roads in 256 places, blocking traffic and forcing police to arrange diversions. One of the blockades halted traffic at the Medyka border crossing west of the Ukrainian city of Lviv.
Protesters in Poznan lit flares and firecrackers and a barrel of waste was poured on to the street. Organisers said some 6,000 farmers had converged on the city.
Many of the farmers bore banners saying no to the EU's Green Deal, aimed at bringing down greenhouse gas emissions.
The atmosphere was more febrile in the city of Bydgoszcz where a pile of tyres and straw were set alight, as well as an EU flag. A group of protestors tried to force their way into a local authority building but the police used pepper spray to stop them.
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