Detectives in Northern Ireland were today questioning a Sinn Fein member as part of an ongoing inquiry.
The man, from north Belfast, was arrested by anti-terrorist officers at his house, the party said.
Sinn Fein councillor Mr Eoin O'Broin said: "Heavily armed PSNI members accompanied by Special Branch personnel raided the home.
"The man has been arrested and taken to the police interrogation centre in Antrim.
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"This man has been the target for PSNI Special Branch operations over the past two years."
The party refused to give further details until legal discussions were completed.
A PSNI spokeswoman said: "A man has been arrested this morning in north Belfast this morning in connection with an ongoing police investigation."