They should be e-mailed to Scotland Yard at: imagesatmet.police.uk. * Three men were arrested yesterday morning under anti-terror laws at Heathrow airport. The three British nationals were detained after they were turned back from the United States, but police sources said they were not being linked to Thursday's bombings The three men are expected to be released overnight.. It is also not yet known if it was a suicide bomber, if the device went off by accident, or whether there was a timer set an hour later than the Tube devices. Detectives revealed that the three bombs on Tube trains at Aldgate, Edgware Road and King's Cross had exploded almost simultaneously at 8.50am. Technical data from London Underground showed there was a gap of about 50 seconds between the first and third explosions.
The later bomb on a No 30 bus at Tavistock Square in central London, which killed 13 people, went off nearly an hour later at 9.47am It is unclear whether the bomber was still on the bus. Plainly, not all went on to become active Islamic terrorists in the UK." Meanwhile, the police are continuing their forensic investigation, which is concentrating on trying to recover fragments of the bomb and traces of the explosives from the four blast sites. Highly computer literate, they will have used the internet to research explosives, chemicals and electronics. "They are also willing to kill without mercy - and to take a long time in their planning." He added: "We believe that up to 3,000 British-born or British-based people have passed through Osama bin Laden's training camps over the years. He said: "I'm afraid there's a sufficient number of people in this country willing to be Islamic terrorists that they don't have to be drafted in from abroad." He continued: "[The bombers] will be apparently ordinary British citizens, young men conservatively and cleanly dressed and probably with some higher education. But Lord Stevens, the former commissioner of the Metropolitan Police - then Sir John - predicted yesterday that the London bombers were "almost certainly" British.
Lord Stevens, who served as commissioner for five years before retiring this year, said that the bombers were "totally aware of British life and values" and although international terrorists may have provided the expertise, it was "wishful thinking" to suspect the perpetrators came from abroad. It is too early to make that judgement," a security source said. Most terrorist experts believe from the initial details of the attacks that an experienced bomber with skills, probably gained from an al-Qa'ida training camp, was involved. It is too early to know whether the terrorists responsible for Thursday's atrocity are British-born Muslims or foreign al-Qa'ida fighters, according to security sources. "The modus operandi that we know so far doesn't give us an awful lot to go on. They don't tell us whether they are a homegrown radicalised unit or overseas grouping, or whether they are mixed.
