The pair - believed to have married as part of their cover - have lived in the U.S. since the mid-1990s.

Richard Murphy is posing as a U.S. citizen born in Philadelphia, Pennsylvania. He is believed to have traveled on a forged Irish passport.

His wife Cynthia is also posing as an American born as Cynthia Hopkins in New York City.

The couple lived in Hoboken, New Jersey. Since 2008 they have lived in a house in Montclair, New Jersey.

They are believed to have children. A neighbour, Louise Shallcross, 44, said she often saw Richard Murphy at the school bus stop.

'We were all very excited to have a stay-at-home dad move in,' she said. 

Another neighbour told the New York Times: 'They couldn’t have been spies. Look what she did with the hydrangeas.'

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