THIS is the chilling CCTV image of terrorist Hasib Hussain as he carries the bomb he used to blow up the No30 London bus.
Police were yesterday piecing together the bearded 18-year-old's final movements before the atrocities, which killed 54 people last Thursday.
With the bomb hidden in his backpack, police said Hussain and the other bombers looked like hikers as they blended in with commuters. Last night, the
fourth bomber - who blew up the King's Cross train - was named by police as Jamaican-born Lindsey Germaine, who lived in Aylesbury, Buckinghamshire.
Searches were being conducted on a property there yesterday, and at various addresses in Leeds and West Yorkshire.
Detectives were thought to be hunting a fifth British-born suspect - believed to have masterminded the plot.
They were also searching for a sixth man, Magdi El-Nashar, 33, who may have helped them.
He had close links with Germaine, who converted to Islam two years ago.
Egyptian-born El-Nashar, a chemistry PhD student, is thought to have handed over his flat in the Leeds suburb of Burley to the gang - possibly to the fifth man. He vanished days before the bombings.
Peter Clarke, the head of Scotland Yard's anti-terrorist branch, issued a plea for information on Hussain's movements in the hour after his three fellow bombers blew themselves up on tube trains.
Hussain, from Leeds, was caught on CCTV at Luton station as the plot to kill innocent travellers was nearing its climax.
Clearly visible on his back is a large rucksack, thought to have contained up to 10lb of plastic explosives.
Casually dressed in jeans and a jacket, it is easy to see how the teenager blended in with thousands of commuters heading into London that morning.
Even police who studied images of the bombers on CCTV at King's Cross station said they looked like a group of hikers.
Hussain is believed to have travelled down from Leeds to Luton with fellow bombers Shehzad Tanweer, 22, and Mohammed Sadique Khan, 30, in a hire car.
With Germaine, they headed to King's Cross where the well-planned operation went wrong. Hussain was unable to board a Northern Line train because the service had been suspended, so he caught the No30 bus instead.
Passengers saw a man looking agitated and rummaging in a rucksack. Seconds later, the bomb exploded killing 13 people.
Hussain's driving licence and cash cards were found in the wreckage.
When he was reported missing by his concerned family, police got the breakthrough they were seeking.