The former Ku Klux Klan leader, David Duke, has been expelled from the Czech Republic over questioning the Holocaust in his latest book.

According to his lawyer Klara Slamova, Czech authorities ordered Duke to leave the country on Friday after he was arrested and questioned by police on suspicion of denying the Holocaust in his book "My Awakening".

The lawyer said she would lodge a complaint against the police on behalf of the 59-year-old American Duke, the Czech news agency CTK said.

The Czech interim prime minister-designate, Jan Fischer, said on Czech television that Duke's opinions in his book were "simply unacceptable, incomprehensible".

Duke was invited to the Czech Republic at the invitation of a local far-right group, Narodni Odpor (National Resistance), and had planned to give lectures in Prague and Brno and promote a book.

Duke once held a seat in Louisiana's state House of Representatives.

HRF/DT