Two of the would-be suicide bombers who tried to blow themselves up on the London transport network last week were named yesterday.

Detectives said the man who targeted a number 26 bus in Hackney Road, east London, was Muktar Said Ibrahim, 27, who is also known as Muktar Mohammed Said.

An accomplice who tried to detonate his device on the Tube at Warren Street was named as 24-year-old Yasin Hassan Omar.

As the hunt for the bombers intensified, armed police raided a flat in a 12-storey tower block, in New Southgate, north London, where Ibrahim is thought to have stayed.

Neighbour Sammy Jones, 33, a mother-of-two, said he had been staying in a flat on the ninth floor which had been occupied for two years by an African man she knew as George.

She said: ''Recently, three other men have been staying there - the Indian-looking man who I think is the man on the bus, and two Somalian men.

''They came around last year and recently they've been staying at George's place again.

''A few weeks ago, George and the Indian man were filling the lift with small brown cardboard boxes. I asked George what it was, and he said wallpaper stripper.''

She said she thought it possible that the Warren Street bomber, Omar, was one of the Somalis who had visited.

Police arrested two men nearby under anti-terror laws, although not at the flat they were searching.

It takes the number of people arrested over the July 21 attempted bombings to five, although none is thought to have been one of the bombers.

Detectives now fear there were five would-be suicide attackers.

Devices were found on the number 26 bus and on Tube trains at Warren Street, Shepherd's Bush and the Oval. The fifth bomb was dumped on open ground at Little Wormwood Scrubs, west London, suggesting that the final member of the suicide team may have lost his nerve.

All the devices were placed within the same type of plastic food storage containers, each six-and-a-quarter litres in size with a white lid, which were then put in dark rucksacks.

Detectives are focusing on tracing the containers, which were manufactured in India and are sold by only about 100 outlets in the UK.

They were labelled ''Delta 6250'' on the lids and also had a label reading ''family containers Delta superior quality''.

Detectives have also established more detail about the movements of the bombers.

Three of them went into Stockwell Underground station shortly before 12.25pm last Thursday.

The first bomber then boarded a Northern Line northbound train and tried to set off his bomb, but he got off at the Oval after it failed to detonate properly.

Mr Clarke said: ''He was chased from the station by extraordinarily brave members of the public who tried to detain him.''

After leaving the station he ran towards Brixton, throwing away his dark top, and was last seen at 12.45pm.

Ibrahim went into Stockwell station at the same time and was seen walking towards the platforms.

By 12.53pm he was getting on a number 26 bus at Bank in the City. He was carrying a grey and black rucksack and sat near the back of the bus.

Having failed to set off his bomb, he got off the bus in Hackney Road, east London, at 1.05pm.

Omar went into Stockwell station at the same time as the other two.

He had a small purple rucksack and tried to set off his bomb on the northbound Victoria Line between Oxford Circus and Warren Street.

Shortly afterwards he was seen in Warren Street station without the rucksack. He vaulted a ticket barrier as he made his getaway.

The fourth bomber, wearing a dark blue baseball cap and carrying a rucksack, entered the Underground system at Westbourne Park station in west London at 12.20pm.

He got on a Hammersmith and City Line train towards Shepherd's Bush and tried to set off his bomb.

Having failed, he fled the train by jumping through a window on to the track and running along the line for two or three hundred yards.

The bomber then fled through the streets, past the BBC building in Wood Lane, and was last seen running under the A40 road, not far from where the fifth device was found at Little Wormwood Scrubs.

It is understood that the Home Office is trawling its immigration databases for the identities of Ibrahim and Omar.

A source said those inquires were likely to be completed today.