PRAGUE (Reuters) - The leader of the Czech far-right Republican Party (SPR-RSC), Miroslav Sládek, was jailed on Wednesday pending trial for alleged anti-German remarks, police said. Sládek was held on the basis of a December arrest warrant issued by a Prague district court after he repeatedly failed to appear in court for trial over remarks he is accused of making at a demonstration a year ago. Sládek, arrested on Tuesday night, was charged with spreading national and racial hatred. He was widely reported to have shouted, among other thngs, that it was a "pity we killed only a few Germans during the (second world) war" at the demonstration last January. The demonstration took place outside a Prague palace in which German Chancellor Helmut Kohl and then Czech prime minister Václav Klaus were signing a declaration aimed at putting historical woes between the two countries to rest. The head of the Republican parliamentary club, Jan Vik, said Sládek's case was purely political as he had been charged for expressing a political opinion. The Republican Party chief, a member of parliament, was given a 10-month suspended sentence in 1996 for attacking a public official and for causing a public disturbance. Members of parliament enjoy immunity against criminal investigation but the chamber of deputies voted to remove this protection from Sládek. The Republicans, who won eight percent of the vote in 1996 general elections, have campaigned against the country's gypsy minority and have frequently attacked government relations with Germany. They also oppose Czech plans to join NATO.