Precious stones worth of $18 M were taken out of the country with forged documents, the president of `Podkrepa` Trade Union, Konstantin Trenchev, announced. He has signalled about 11 other deals. Dr. Trenchev also said that this week he would make public another affair with the export of two huge precious stones (emeralds) through Sofia Airport, where they had been deposited. The documents for their transportation were forged. In his opinion all this was impossible to happen without the involvement of the airport personnel, customs officials and other institutions.