Authorities have attached four properties in Maharashtra and Gujarat belonging to the prime accused in the last year`s case of seizure of mephedrone worth Rs 4,856 crore, a Mumbai Police official said.

The competent authority of Smugglers and Foreign Exchange Manipulators (Forfeiture of Property) Act and the Narcotic Drugs and Psychotropic Substances Act confirmed the action against the properties worth more than Rs 2.67 crore owned by Prem Prakash Singh, the main accused in the case, the official said on Wednesday.