Bulgarian customs agents today seized a shipment of 28 kilograms of heroin on the border with Serbia, dpa cited the Interior Ministry as announcing. The drugs, with a street value of 1.7 million euros (2.4 million dollars), were found stashed beneath the front seats of a car belonging to a Bulgarian who once previously, in 2000, had been arrested for smuggling heroin. Bulgaria lies on one of the chief routes for drug smuggling between the Balkans and western Europe. Last year the country seized about one tonne of heroin.