One of America's most wanted paedophile's convicted of child molestation has been caught secretly living in London.

Shawn Sullivan, who molested two 11-year-old girls and had sex with an unconscious 14-year-old girl, was the US' most wanted sex criminal since 1994.

He was finally picked up by the Met Police last year in England, the Daily Mail reports.

Minnesota State reportedly wants Sullivan, 42, extradited to face charges and a spokeswoman for Dakota County Attorney's office said they had been working with the UK to ensure he is.

According to the report, Sullivan was granted bail in December, asked to wear an electronic tag and abide by a strict curfew.

Sullivan, who is originally from Georgia, had gone years without showing on the radar as a fugitive from the US government.

During this time he lived in Ireland and was given a suspended jail sentence there for sexually attacking two 12-year-old girls.

After marrying an Irish woman, Sullivan moved to England last year on an Irish passport and arrived undetected using the Gaelic spelling surname O'Suilleabhain.

In 2007 that Interpol, the international police organization, added him to its most wanted list, the paper said.

Meanwhile, the Home Office confirmed Sullivan's extradition was ordered in February but it is being contested by the convicted paedophile.