Police seized 31 kilograms of heroin from the Cantt Station in Karachi.
The heroin was found in a case of guavas on a Pakistan Business Express train during a search operation.
The train had traveled from Lahore to Karachi.
According to reports, the case was put on the train in Rohri, a town in Sukkur.
Police and Rangers arrived at the scene and discovered a number on the package.