Johor police chief Ab Rahaman Arsad said the 12.30am raid on the apartment at Residensi Mutiara Indah in Aliff Heights led to the arrest of three men and a woman, aged between 21 and 24.

Police found more than 11.6kg of MDMA, 13 packets of ecstasy powder (0.342kg), one packet of ketamine (0.02kg), one packet of syabu (0.11kg), 1,796 Erimin 5 pills and repackaging equipment, Bernama reported him as saying at the Johor police headquarters today.

A check on a car at the parking lot also led to the discovery of three packets of ketamine, bringing the total seizure to an estimated 12.95kg.

Ab Rahaman said two of the suspects were tenants at the apartment, while another is believed to be the 24-year-old mastermind of the syndicate. The woman is his girlfriend.

He said the syndicate used the gated residence to store and repackage the drugs before distributing them to the local market.

He said the drugs were sourced from outside Johor for direct sale and were enough to supply about 43,726 addicts.

Three suspects tested positive for benzodiazepine, while one tested positive for ketamine.

The case is being investigated under Section 39B of the Dangerous Drugs Act 1952 for drug trafficking.

All four suspects have been remanded for seven days until Sunday.