A man arrested in connection with the 1974 Birmingham pub bombings which killed 21 people is reported to be Michael Patrick Reilly.
The blasts at the Mulberry Bush and Tavern in the Town pubs on the night of 21 November also injured 220 people.
Police said a man, 65, was held at his Belfast home on Wednesday under Section 41 of the Terrorism Act 2000 and would be questioned in Northern Ireland.
Mr Reilly has strongly denied any involvement in the bombings.
Source: BBC News