An adviser to Polish Prime Minister Kazimierz Marcinkiewicz was refused entry into Belarus and briefly detained at the border, he said on Sunday, according to Reuters. "Belarussian border guards asked me to leave my car, took my passport and told me I was an undesirable person," Michal Dworczyk, the prime minister's adviser for emigre and Polish ethnic community affairs, told all-news channel TVN24. "We will have the Foreign Ministry clarify the matter with the Belarussian Embassy in Warsaw and we will also request clarification," government spokesman Konrad Ciesiolkiewicz was quoted by PAP news agency as saying. Dworczyk said the incident was probably a reaction to his previous contacts with activists of the Union of Poles in Belarus who are supported by Warsaw but whose leadership of the 400,000 strong Polish ethnic community there is not recognised by the government of President Alexander Lukashenko.