Four men arrested during a police raid on a luxury flat in Yuen Long in the New Territories on Friday were suspected to be making dangerous drugs.

Police raided a 1,000-square feet apartment in Uptown, a luxury housing estate in Hung Shui Kui in Yuen Long, in the early hours on Friday and confiscated 50 kilograms of suspected cocaine found inside the flat, Sing Pao reported.

Police found and confiscated 10kg of suspected crack cocaine, plus other illegal substances – 30 liters of suspected liquid cocaine, about 150kg of suspected cocaine mixture powder, plus chemical substances and equipment which could to manufacture 40kg of cocaine.

Altogether, the 50kg of suspected cocaine had an estimated street value of HK$59 million (US$7.56 million).

A 38-year old man from Peru named Casado Montalvo Omar Esteban, who arrived on a tourist visa, was arrested. It is alleged that he came to Hong Kong to teach locals how to manufacture these illegal drugs.

The other three suspects were all local jobless men, including 35-year-old man surnamed Mak, 28-year-old man surnamed Fong and a 19-year-old man surnamed Chan. Mak and Fong had criminal records, while one had a triad background.

Police said the gang rented the apartment in October and used it as a manufacturing base. To avoid being discovered, they diffused essential oils inside the flat and corridor to cover the smell when they made the drug, am730 reported.