Customs officers at Malko Tarnovo border checkpoint seized 28 kg of heroin at the amount of more than BGN 3.5 mln, the Regional Customs Agency in the coastal town of Burgas informed. A car has tried to pass the border checkpoint on Wednesday afternoon. Two Bulgarians were travelling in the car. The customs officers found 55 packages with dust like substance, which was tested positive for heroine with high quality at the back seat the car.