BBC says." Abu Qatada is alleged to have played a key role in extremist circles in the UK.
The radical Islamist preacher Abu Qatada is to be released on bail within 24 hours, officials say.
A senior judge has signed papers authorising the release of Qatada, previously described as Osama Bin Laden's right-hand man in Europe.
The Palestinian-Jordanian preacher will be subjected to a 22-hour home curfew and other restrictions on his liberty.
Home Secretary Jacqui Smith said she was "disappointed" with the decision, and said the government would appeal.
Qatada, once described by a judge as a "truly dangerous individual at the centre of al Qaeda's activities in the UK", is being held in Long Lartin jail in Worcestershire.

I am appealing to the House of Lords to reverse the decision that it is not safe to deport Qatada and the other Jordanian cases.
Home Secretary Jacqui Smith
Last month the Court of Appeal blocked his deportation to Jordan, where Qatada has been convicted in his absence of involvement in terror attacks.
Appeal Court judges feared evidence gained from torture could be used against Qatada in a future trial.
Restrictions
On Tuesday he was granted bail, with strict conditions, by Mr Justice Mitting of the Special Immigration Appeals Commission (SIAC).
As well as the wearing of an electronic tag, the restrictions include a ban on attending a mosque and leading prayers or religious instruction.
Qatada must stay in his West London home for at least 22 hours a day, and cannot attend any kind of meeting. He is also forbidden from using mobile phones, computers or the internet.
Police have special permission to enter and search his home while Qatada is banned from having guests other than family and solicitors.
Among the people he is banned from meeting in London is Osama bin Laden.
Others include bin Laden's deputy Ayman al-Zawahiri and Rachid Ramda, who has been convicted in France of masterminding a series of bombings in 1995.
Also named is hate preacher Abu Hamza.

Ms Smith said she was disappointed that Qastada had been been granted bail, even though the conditions were strict ones.
She added: "I am appealing to the House of Lords to reverse the decision that it is not safe to deport Qatada and the other Jordanian cases.
"The Government's priority is to protect public safety and national ecurity and we will take all steps necessary to do so."
Wanted man
Qatada became one of the UK's most wanted men in December 2001 when he went on the run, on the eve of government moves to introduce anti-terror laws allowing suspects to be detained without charge or trial.
In October 2002 the authorities tracked him down to a council house in south London and took him to Belmarsh Prison.
He was eventually freed on bail in March 2005, but was made the subject of a control order to limit his movements.
In August that year he was taken back into custody pending the extradition to Jordan."

The politicians should stop bellyaching. They got us into this mess with their human rights legislation. This man should be deported. He hates the West, so send him somewhere Islamic.