Britain has barred the radical Muslim preacher Omar Bakri Mohammed from returning to the country.
The interior ministry said his presence was not “conducive to the public good.”
The cleric is reportedly being held by authorities in Lebanon. He went there last Saturday on what he described as a holiday to see his mother in Beirut.
Bakri had lived in the UK for 20 years and was the founder of the controversial al-Muhajiroun group, due to be outlawed.
He gained notoriety by calling the September 11 hijackers the “magnificent 19.”
He recently caused fury by saying he would not report British Muslims if he knew they were planning terrorist attacks.
However on other occasions he has insisted he does not condone the taking of innocent lives.