On Friday, three separate searches were conducted in the municipalities of Ixelles, Laeken and Jette.
The Brussels Prosecutor's Office indicated to Belga News Agency that these searches were carried out at the request of an investigating judge.
The investigation began in March after police received information about the possible existence of a hidden drug lab. Two suspects were then identified by police.
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Both the laboratory was uncovered on Friday at Rue Van Aa in Ixelles. The suspects were apprehended on the same day in Laeken.
€10,000 was discovered hidden behind a bedside table in the suspects' house in Laeken; narcotics were hidden in a false ceiling in the lab in Ixelles.
In total, 4.88 kilograms of cocaine, as well as three mobile phones and a vehicle, were seized.
The investigating judge later issued an arrest warrant for both suspects and they have been charged with unlawful possession illicit manufacture of narcotics.