Police in Britain investigating last week's London bombings have released the first CCTV picture of all four suicide bombers together at Luton station.
It is hoped the picture, showing the four men wearing rucksacks, will help detectives find out more about their final movements.
Meanwhile, police have also officially identified the third and fourth bombers.
It is thought that 30-year-old Mohammed Sidique Khan was responsible for the explosion on a tube train at Edgware Road. Germaine Lindsay, who was 19, died in the explosion near King's Cross.
Elsewhere, British detectives investigating the bombings have travelled to Cairo in Egypt where a 33-year-old biochemist is being questioned in connection with the attacks.
An Egyptian Interior Minister has said the biochemist has no links with al-Qaeda.
Magdi Mahmoud al-Nashar was arrested in Cairo yesterday but denies having a role in the attacks.
Meanwhile, police in Pakistan are also questioning six people believed to have been involved with the suicide bombs.
The death of man in hospital overnight brought the death toll from the bombings to 55. Lee Harris, 30, had been caught up in the blast at King's Cross Station.
Senior Muslim clerics in Britain have issued a statement condemning the bombings in London.
Leaders and scholars from all over Britain gathered at the Islamic Cultural Centre in central London last night for an unprecedented meeting in response to last Thursday's attack.
Moulana Shahid Raza, the head Imam at Leicester Central Mosque, said Islam had to address the problems which could drive Britain's Muslim youth towards extremism.
