The leader of Greece's far-right Golden Dawn party Nikolaos Mihaloliakos has been arrested on charges of forming a criminal organisation.
Police are currently investigating the party for links with the killing of an anti-fascist rapper by a self-proclaimed Golden Dawn supporter.
The stabbing to death of Pavlos Fissas on 17 September sparked violent protests in the capital of Athens.
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Austria is set vote for its new president again - and possibly elect the first far-right head of state in Europe since World War Two.
Italians go to the polls in a referendum on Sunday which could spell the end of Matteo Renzi's reign as prime minister.
A thief who posed as a council worker snatched cash from an 86-year-old woman's pension book, the Met Police said.