There are around 250 tractors blocking the main roads in the neighborhood of the EU and Brussels institutions.
This was reported by the riot police present on site.
Tension between protesters and law enforcement is high.
After activating the water cannons, the police used tear gas to keep the increasingly violent action under control.
For a few minutes the farmers have been using firecrackers to explode several bales of hay.
A fire was set near the entrance to the Maelbeek metro station, behind the European Council.
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