Such statistics have been presented to journalists by Vladimir Gordiyenko, chief of the Interpol's National Central Bureau in Russia. However, Mr. Gordiyenko found it difficult to name the exact figure, because "the information is changing all the time," he said. "But there are obviously thousands of them," he added. Mr. Gordiyenko said that not long ago members of one of the well-known Russian criminal groups had been detained in Spain with the help of the Interpol. They lived in Spain under the guise of Greek citizens using faked passports. According to Vladimir Gordiyenko quoted by RIA Novosti, "their extradition to Russia is being currently considered."