Three persons of the gang were arrested under the Narcotic Substances and Psychotropic Substances Act, 1985.
A police team — led by Satya Narayn Chaudhry, additional commissioner of police (south region), and senior inspector Shabana Shaikh — on Thursday first arrested an accused Isaq Sayyed (38) and seized 12 grams mephedrone (MD) from Dongri.
A case was registered under the NDPS act.
While working on the case, the police team also arrested Abdu Wasim Shaikh (31), from Vashi, and seized 56 grams MD and other articles.
During their interrogation, police learnt about the involvement of another accused, Deepak Bangera (55), and arrested him from Ghatkopar on Saturday.
During Bangera’s flat search at Sun Flower Apartment in Kalina village, Santacruz, on Sunday, investigators found 25 kg Mephedrone worth Rs 12.5 crore, Rs five lakh, two weighing machines and packing materials of drugs.
The materials found at the flat were seized under a panchnama.
Further probe is under way to find out the source of the drug and where it was to be supplied.