Investigators are working to unravel strands of the two bombing plots.
LONDON (AP) -- Police interrogated suspects Saturday in the botched transit attacks and sought the extradition of another reported bomber from Italy. As they hunted for accomplices possibly still at large, authorities warned Londoners not to let down their guard against terrorism.
The four arrests Friday in dramatic raids in London and Rome helped ease the fears of a city on edge since four suicide bombers killed 52 people on subways and a double-decker bus July 7. The bombing attempts July 21 took no lives but further rattled nerves.
"Britain fights back as our brave police catch ALL the cowardly suicide bombers," the Daily Express tabloid exulted in a headline.
"Caught Like Rats in a Trap" said The Sun newspaper, alongside a photo of two bare-chested suspects with their hands in the air.
With all those suspected of carrying out the two sets of attacks believed dead or in custody, investigators were working to unravel the strands of the two plots.
Police were searching for those who may have recruited and directed the bombers, while also seeking links between the terror cells, one believed to be made up mostly of Pakistani Britons, the other mainly of East African immigrants to London.
The Sunday Times reported that investigators believed a third terror cell was still at large.
In Rome, a lawyer for jailed suspect Osman Hussain, 27, suggested Hussain would fight British extradition efforts, a process that could take several months.
Hussain, an Ethiopian-born British citizen, is suspected of trying to bomb the Shepherd's Bush subway station in west London on July 21. He reportedly told investigators the bombers were motivated by anger over the Iraq war.
A legal expert familiar with the investigation told The Associated Press in Rome that Hussain had admitted to a role in the attack but said it was only intended to be an attention-grabbing strike.