Holocaust denial is classed as a crime in many countries
An alleged Holocaust denier has been arrested by police after flying into Heathrow Airport in London.
The Met Police's extradition unit detained Australian Gerald Frederick Toben under a German-issued EU warrant.
He is accused of publishing material on the internet between 2000 and 2004 that "denies, approves of or plays down the mass murder of Jews by the Nazis".
Mr Toben, 64, later appeared before City of Westminster Magistrates' Court and was remanded in custody.
A further hearing will take place on Friday.
He told the court he did not consent to extradition and would fight attempts to send him to Germany.
Mr Toben, who had been in transit from the US to Dubai at the time of his arrest, represented himself at the hearing.
He said his apprehension had been an abuse of process.
The arrest warrant alleges that Mr Toben committed the offence in Australia, Germany and other countries, and that the material is also "of an anti-Semitic and/or revisionist nature".
It was issued by a court in Mannheim, Germany, where Mr Toben was given a 10-month jail sentence in 1999 after publishing a newsletter which denied the mass extermination of Jews in gas chambers at Auschwitz.