All four members of a suspected suicide bomb gang were in custody last night after anti-terror police scored a major breakthrough.

The three suspects who were still on the run were captured yesterday - two days after the fourth had been arrested in Birmingham.

Two of the remaining trio were held in a swoop on a London flat, which was captured on video.

One man identified himself to police as Muktar Said-Ibrahim, 27, who allegedly tried to blow himself up on a number 26 bus in Hackney, east London, in the failed bomb attacks on July 21.

The other said he was Ramzi Mohammed. Police are believed to suspect he was behind the attempted bombing near the Oval Tube station on the same day.

A third man was held in Rome yesterday. The head of Scotland Yard's anti-terrorist branch Peter Clarke announced last night that he was identified as Hussain Osman and was of interest to the investigation.

The Italian authorities described him as a Somali man, a naturalised British citizen.

It thought police believed he attempted to blow himself up on a Tube train at Shepherd's Bush on July 21.

Reports from Italy said Osman was 27 years old and had a brother living in Rome. According to unconfirmed reports, he was traced through telephone contacts after fleeing to Italy in recent days.

The fourth bomb suspect, Yasin Hassan Omar, is a 24-year-old Somalian alleged to have tried to set off a bomb on a train near Warren Street. He was held during an operation in Birmingham on Wednesday.

Although the four suspects are now in custody, Mr Clarke remained cautious last night.

He did not connect any of the men held yesterday with any of the specific bomb attacks in a statement he made shortly after 7pm. And he added: "We must not be complacent. The threat remains and is very real."

The London suspects were seized during a raid on an estate in Dalgarno Gardens, near Wormwood Scrubs Prison, west London.

Mr Clarke said: "Two men were arrested who had been in a flat in the Peabody Buildings.

"One of those men has identified himself as Ibrahim Muktar-Said. The other man has said he is Ramzi Mohammed.

"The men in the Peabody Buildings were asked to surrender to police but failed to do so.

"As a result, and in order to reduce any risk to police and the public, specialist tactics were used. The premises will now be thoroughly searched."

Mr Clarke added: "I can also confirm another man of interest to the investigation has been detained in Rome.

"We have been liaising with the Italian authorities, a European arrest warrant has been issued and we will be seeking the return of that man to this country."

He said the name on the warrant was Hussain Osman.

A police source said the next stage of the investigation would focus on establishing whether the suspects had a support network and on establishing links with any other individuals.

Detectives believe there was a fifth bomber because a fifth device was found last Saturday in a rucksack dumped in Little Wormwood Scrubs, a few hundred yards from yesterday's operation.

It is believed the bomber may have tried to detonate the device on a bus or train but no one noticed and he dumped it.

Another man was arrested in a second raid yesterday in Tavistock Crescent, Notting Hill, about a mile from the Peabody Buildings estate. It was not clear whether police believe he was linked to the fifth device.

The main raid yesterday involved plain-clothed firearms officers and snipers from Scotland Yard's SO19 unit.

Footage of the moment police swooped to arrest the two men was screened last night. Two shirtless men were shown in the images, shown by ITV News, after emerging from a flat on to a walkway as armed police shouted orders at them.

Both men held their hands above their heads. Both are seen spitting and clearing their noses - possibly a result of gas that police had used to stun them.

In the other raid, dozens of officers, some wearing gas masks, swooped on the Tavistock Crescent area of Notting Hill, clearing a wide area and cordoning off streets.

Snipers were stationed behind parked cars.

Armed police also arrested two women at Liverpool Street station, in the City of London, yesterday. The mainline station and the Underground station were evacuated while police looked at a number of suspect packages.

Police later confirmed a further raid was mounted at an address in the Old Kent Road area.

Scotland Yard said no arrests had been made and confirmed that searches were continuing.

Stunned and gassed - Page 3

Comment - Page 10