ONE of the failed London bombers was arrested today during dawn raids in Birmingham, say police sources.
Three other men were arrested in the swoops at two addresses.
Nearby homes were cleared after a suspect package was found during the raid at the property where the suspected bomber is thought to have been.
He was said to have been shot with a Taser stun-gun during the raid, although no firearms were discharged.
The man was taken to the capital's Paddington Green police station, where all key terror suspects are held.
Today's raids were said to be of major significance in the hunt for the bombers.
They followed the arrest of two men last night at Grantham railway station under the Prevention of Terrorism Act as they travelled from Newcastle to King's Cross.
The arrests were made after information from two off-duty Metropolitan Police officers who were on the train.
Speaking near the scene of the Birmingham raids, West Midlands Police Assistant Chief Constable Stuart Hyde refused to comment on reports that the man detained there was one of the four would-be suicide bombers.
Mr Hyde said officers had used a stun- gun to ensure a safe arrest.
Mr Hyde said at least 50 officers were involved in both raids.
Police have been working round the clock to track down the four involved in last week's failed bombings, amid fears they may try another attack.
Those fears were heightened by evidence that they had access to more explosive material and may have returned to the bomb-making flat they used in New Southgate, north London, after the botched suicide bombings.
People near the Birmingham maisonette told of their shock.
Mandy Higginson said she had seen people coming and going from the property. "There are Somalians living there," she said. "I have only ever seen two or three men."
She said the property was unkempt, but she had seen nothing to arouse suspicion.
* Suicicde bomber Jermaine Lindsay, who used to live in Rawthorpe, probably did not use a web-based flight simulator to practise flying passenger planes.
A Jermaine Lindsay was listed as a "pilot" with a web-based group of flying enthusiasts.
But it has emerged he is unlikely to be the same man.
* One of the police involved in the shooting of innocent Brazilian Jean Charles de Menezes has been given a free holiday by the Metropolitan Police.