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.
"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."
