A spokesman for Scotland Yard said a man in his 60s from Bedfordshire had been interviewed when he answered bail on Monday.
He said the man was "further arrested on suspicion of sexual offences in connection with further allegations made to Operation Yewtree".
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US presidential hopefuls have landed in New Hampshire as the next stage of voting for Republican and Democratic party candidates began.
John Rowlands died in the attacks in 1974 - his son Paul is among victims' families calling for an inquest into their deaths to be reopened.
The former England captain took to Instagram to show off his pancake flipping skills on Shrove Tuesday - and poked fun at his son's efforts.