It said on a tip off that a huge quantity of charas, smuggled from Afghanistan, had been stored in an upper storey of a house in Surjani Town, Karachi, for shipment abroad, a raiding team of customs officials headed by an assistant collector of preventive collectorate, Karachi, rushed to premises and conducted the search, which led to the recovery of 3950 slabs of charas from 307 cardboard cartons filled with cotton rags, each weighing one kilogram.
The charas slab bore marks of "Mazar Sharif, Afghanistan".
Preliminary investigation showed the upper storey of the house was hired for packing hashish/charas and concealing the same in rags for its foreign destination. The drugs were earlier shifted to the premises by two trucks.
In the recent years, the seizure of 3.93 tons of hashish is the biggest in the preventive collectorate.
An FIR has been booked under Control of Narcotics Substance Act, 1997 and a specially constituted investigating team is conducting raids at hideouts of accused.
Important clues have been found, which were likely to lead to arrest of accused persons very soon, the statement added.