Britain is to extradite Abu Hamza al-Masri, the jailed Muslim preacher, to the United States to face "terrorism" charges.
Washington claims that al-Masri was part of a global plot to wage war against Western countries, and want him to stand trial over the 1998 abduction of 16 tourists in Yemen.
Jacqui Smith, Britain's interior minister, signed the extradition order on Thursday.
Al-Masri has 14 days to appeal against the decison. If he does not do so, he will be handed over to the US authorities within 28 days.
Al-Masri is also accused of helping to set up an illegal military-style training camp in the north-west US state of Oregon and of helping to fund recruits to attend another camp in the Middle East.
Al-Masri, who was an imam at the Finsbury Park mosque in north London, has been in prison since February 2006, when he was sentenced to seven years for crimes of race hatred and soliciting to murder.
Born in Egypt but British by marriage, al-Masri is being held in the high-security Belmarsh prison in south-east London.
He was originally arrested on an extradition warrant from the US authorities in May 2004.
But the extradition process was put on hold until after his trial, which his legal team claimed was politically motivated, and an appeal against his conviction.
The path was cleared for extradition hearings when Britain's highest court ruled in January 2007 that he had no grounds for appeal.