Islamabad , Pakistan ( CNN ) -- Two men were arrested in southern Pakistan this week on suspicion of trying to smuggle a batch of heroin disguised as onions out of the country , authorities said . Officials seized 125 kilograms ( 276 pounds ) of heroin Wednesday during the incident in Karachi , said Meraj Mohammad Channa , a customs official . The suspects made the drugs look like onions by using paint and plastic and then stashed them in bags of real onions , Channa said . The drugs and vegetables were set to be shipped to Malaysia until customs officials inspected the shipment . Two men were arrested and authorities were looking for one more suspect , Channa said .
Customs officials seized 125 kilograms of heroin in Karachi . The suspects are accused of making the substance look like heroin .