Based on a tip-off, the Directorate of Revenue Intelligence (DRI), Mumbai, intercepted a Nigerian woman suspected of carrying narcotics from Delhi to Mumbai by bus. 

The late-night operation involved 50 kilometres of surveillance before officials finally stopped her and searched her luggage, as per news agency ANI. 

"Upon examination of her luggage, officers recovered food packets (oats) and juice tetra packs containing a crystalline substance and tablets. Laboratory testing using the NDPS Field Test Kit confirmed the substances to be 2.56 kilograms of methamphetamine and 584 grams of ecstasy tablets." DRI said in a statement on Thursday, as reported news agency ANI.