With all suspects connected to the medical profession, Prime Minister Gordon Brown has ordered an investigation of the procedures of recruiting foreign doctors, which Health Secretary Alan Johnson promised would be done "very quickly.

He said they were the innocent victims of Nifong's "tragic rush to accuse."In his initial letter of resignation, Nifong said he would leave office July 13.

That didn't satisfy Hudson, who was already considering a petition to remove Nifong filed by a Durham resident earlier this year.Before Thursday's hearing, he had suspended Nifong with pay and forced him to turn over the keys to his office.

Nifong has already been temporarily replaced by his predecessor, Jim Hardin, who will serve until Gov.

Mike Easley appoints a permanent replacement.Robert E.

Zaytoun, the Raleigh lawyer Hudson appointed to prosecute the removal, said Nifong was out of state when he spoke with him Wednesday.

He planned to return Monday and refile his resignation, Zaytoun told the court.The men, all from London, were arrested after police found homemade devices on trains and buses that had failed to detonate properly - sending puffs of smoke from backpacks that frightened commuters, but injured no one.

Early reports from law enforcement officials indicate that the car bomb found Friday morning may also have failed to detonate properly - causing smoke to appear in the passenger area.It was the smoke that prompted people to call explosives officers to the scene.

One explosives expert told the British Broadcasting Corporation that the device - comprised of gas canisters and nails - appeared to be a fairly crude construction, and not the work of anyone with an extensive knowledge of weaponry.Britain has wrestled since the July 7, 2005, over how to deal with the threat of "homegrown" terrorism.

Young men from the country's large Muslim population are easy prey for radical clerics and propaganda campaigns propagated on Internet forums such as al Hesbah.