According to the country's Anti-Narcotics Force and the Interior Ministry's Pakistan Rangers troops, who carried out the operation, the gang were hollowing out onions, inserting capsules of heroin, then capping the onions with glue. The smugglers apparently confessed that the smell of the onions would hopefully prevent sniffer dogs from detecting the drugs, Pakistan Today says . In the end, the gang were apprehended following a surveillance operation.