Hubert Aiwanger was the deputy premier of the German state of Bavaria and leader of the small conservative Free Voters party. (EPA Images pic)BERLIN: A prominent German politician was found dead in a Berlin hotel on Wednesday, police said, adding they had launched an investigation.

The cause of death of Hubert Aiwanger, 55, who was deputy leader of southern Bavaria state, was not immediately clear.

Police in the capital said in a statement he was "found dead in his hotel room" in the Berlin-Mitte district.

Police and prosecutors had opened a probe to "determine the specific cause and circumstances of death and to rule out any possible involvement of third parties", the statement said.