Four suspected would-be suicide bombers have been rounded up by police hunting those responsible for the failed July 21 attacks in London.
The fourth man was held in Rome today, an Italian Government minister confirmed.
He was described as a Somali man called Osman Hussain who is a naturalised British citizen, Minister Giuseppe Pisanu said.
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The Italian police operation is continuing.
Earlier, two men detectives strongly believe to be would-be suicide bombers were arrested in London.
One of them was believed to be Muktar Said-Ibrahim, 27, who allegedly tried to blow himself up on a number 26 bus in Hackney, east London.
The other is believed to have been responsible for an attempted bombing near Oval Tube station on the same day.
A third man was also arrested as armed police launched two raids in west London this morning.
Police believe there were almost certainly five bombers on July 21. The fifth man is still on the run.
Reports from Italy said Hussain was 27-years-old and had a brother living in Rome.
Italian police have been collaborating with Scotland Yard and British intelligence agencies.