The Narcotics Control Bureau has arrested eight persons, including, six Iranians, a Dutch and an Indian national, after it raided two factories here and seized chemical drugs worth over Rs. 25 crore.

NCB officials said that based on specific intelligence, a search was carried out in two factories in Thane.

The Bureau seized about 8.5 kg Methamphetamine, 60 kg of Ephedrine and huge quantity of other chemicals and equipment including 8 kg Amphetamine, 630 kg Ephedrine powder mixed with PVC resin powder and tablets among others.

“A Dutch, six Iranians, one Indian and a Colombian national was arrested,” a statement released by NCB said.

Official said more chemicals, all used for making of illegal drugs, were seized from the residential premises of the accused.

The factory was allegedly “used for extraction of Ephedrine/Pseroephedrine from such tablets for illegal manufacture of Methamphetamine.”

The seizure of such high quantity of psychotropic substances and precursor chemicals is said to be one of the biggest in the country.

“The seized drugs are valued at Rs. 25.55 crore in the international illicit market,” NCB said.