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The former Irish prime minister Bertie Ahern has warned dissident Republicans could use a re-introduction of border posts in Northern Ireland to justify their campaign of violence.
He said a hard border, with customs checks, will have to be re-introduced because of the UK's decision to leave most of the customs union under Brexit.
Mr Ahern drew a comparison with the IRA's Border Campaign in the 1950s.
But he said he did not expect a return to large-scale violence.
Mr Ahern was speaking to ÃÛÑ¿´«Ã½ Newsnight ahead of elections to Northern Ireland's Assembly on Thursday.