Investigation into the Pune police's biggest-ever seizure of mephedrone has revealed that the banned drug used to be smuggled to London through a courier firm in Delhi after being concealed in ready-to-eat food packets, a top official said on Wednesday.

Pune police has so far seized approximately 1,700 kilograms of mephedrone and a couple of locations in Delhi, newswire PTI reported. Eight people have been arrested in this connection and their linkages are being investigated, Pune Police Commissioner Amitesh Kumar told PTI.