The Dutch police found four bodies in a business building in Enschede on the border with Germany. They were most likely shot dead, the police said.
The four men between the ages of 27 and 62 were killed in the building the day before.
Against two of the victims ran a criminal case for drug offenses. More details about the men and the crime did not call the police, the investigation is still ongoing.
According to Dutch media reports, the police were out Tuesday after local residents reported noise at the wholesaler of gardening products the previous night. A few months ago, the police discovered a few kilos of cannabis there.