Armed police conducted a search of the hospital this afternoon and this has been completed. This type of malfunction used to happen to the IRA, who had expert bombmakers. It could be bad workmanship or it could be a deliberate attempt to disrupt the city two weeks later."There had been reports that the staff at University College Hospital had been told to look out for a man of black or Asian appearance wearing a blue top who had run into the hospital. The base ingredients - drain cleaner, bleach and acetone - can be bought easily without attracting suspicion; its chemical composition is simple, and in its finished form it is almost undetectable by sniffer dogs or conventional bomb-detection systems.The detonators used in yesterday's attack appear to be the weak point. One of the key questions is whether the material used in the explosive is the same homemade material used in the bombs of 7 July. Police are still struggling to discover the make-up of the explosive used two weeks ago, but it is thought to be of a type similar to material known as the "Mother of Satan", triacetone triperoxide or TATP.
Sir Ian refused to confirm or deny reports that the devices were packed with nails and shards of metal.It is still unclear what type of explosive was used in the bombs. Officers also began to study CCTV footage.Unlike the 7 July bombings, by suicide bombers prepared to sacrifice their lives, the terrorists yesterday abandoned their bombs and fled, pursued at least on one occasion by passers-by.The detonators on at least two of the devices are believed to have initiated but did not ignite the explosive in the rucksacks One did not detonate at all, and another only partially In all four, the main charges were not detonated. Witnesses said they saw a man running into the nearby University College Hospital. Armed officers entered the hospital and after 4.20pm a police convoy left at high speed with motorcycle outriders.Two men were arrested in the afternoon, including one at Whitehall, who was ordered to the ground by armed police.
But police said that they were not linked to the attacks.Passengers who had streamed out of the trains and the No 26 bus at Hackney Road, in Shore ditch, east London, were corralled by police into makeshift interview areas for statements and to check whether they had taken any images with their mobile telephones.
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The Metropolitan Police Commissioner Sir Ian Blair said: "We believe this may represent a significant breakthrough."Sir Ian added that the attempted blasts on three Tube trains and a bus, a copy of the 7 July attack, "must have been to kill". He said he was not in a position to state whether the two attacks were connected, but he added: "There were four attacks and there were four attacks before. We can all see that the attacks have a similar pattern."Detectives are waiting to question a man believed to have been injured in the attempted attack at Warren Street. The security agencies had been caught out by the 7 July bombings which, Home Secretary Charles Clarke admitted, "came out of the blue".
