Officials have found 600 kilograms of cocaine in two apartments in Rotterdam, Netherlands.
The drugs worth approximately 18 million to 24 million euros has been destroyed.
Investigators had noticed men entering the apartments continually, carrying large bags.
The police trailed a suspicious car and found a third apartment.
A man and a woman were caught counting money, supposedly from illegal drug sales.
Authorities have confiscated two million euros, Dutch news agency ANP reports.
The police said four suspects were arrested during operations this week.