Farmers from northern Greece drove dozens of tractors and pickup trucks in front of the White Tower, landmark of the city of Thessaloniki on Thursday to protest against the recent increase in the taxes and social security contributions they pay. /CFP Photo

Farmers clashed with riot police outside an exhibition center hosting a livestock fair, before breaking down the door. /CFP Photo

The protest was organized to coincide with the livestock fair, with the purpose of drawing attention to the farmers’ claims. /CFP Photo