Police in the Netherlands opened fire on tractor farmers protesting government plans to reduce nitrogen emissions Tuesday night in the north of the country.

This was reported by Politico.

Police said they responded to the threatening situation when farmers trying to overcome the blockade and take the highway in the Friesland region began pointing their tractors at police officers and their vehicles.

According to Friesland police, their shots hit the tractor, but no one was hurt. Three suspects were detained.

An internal Dutch government investigator said he is investigating the events of the police use of weapons.

Dutch farmers protested this week against government plans that could require farmers to use less fertilizer and cut livestock, which could lead to the closure of some farms.

The Dutch government wants to reduce nitrogen oxide and ammonia emissions from livestock by 2030. According to the plans, reductions could reach 70 percent in some areas.

In response, farmers blocked supermarkets, distribution centers and roads this week. According to media reports, farmers are demonstrating at Groningen airport on Wednesday morning.