A 68-year-old man from the municipality of Midden-Groningen is also still in custody. A 65-year-old woman from the same municipality has been released, but she remains a suspect.
The two men who are now in custody are suspected of manufacturing synthetic drugs. The man from the municipality of Midden-Groningen is also suspected of waste dumping.
At the end of this month, a decision must be made about the extension of the pre-trial detention of the man from the municipality of Oldambt. The man from Central Groningen will stand before the council chamber at the beginning of October.
A day after the drug lab was discovered, the police found the body of a man from Roermond in the building. The 38-year-old Tess Abels had no fixed place of residence or residence. Investigations must determine the connection between the discovery of the drug lab and the dead man.