But he added: "The Chatham House report also said the Iraq war had made it easier for al Qaida to exploit a sense of grievance among the Muslim community. "It's fair the Government should ask itself whether policies such as those involving the Iraq war have contributed to this. "We need a partnership between Government and Muslims to show people they are not being ignored and that their concerns will be heard." British Muslim religious leaders and scholars issued a fatwa outside the Houses of Parliament yesterday in response to the London bombs. It condemned the use of violence and stated that suicide bombs were " vehemently prohibited". Police today were meanwhile still trying to establish exactly what kind of explosives were used in the July 7 blasts. Forensic experts were scrutinising the four blast sites to determine the exact make-up of the substance and to see whether it can be linked to the home-made explosives found at a so-called "bomb factory" at a property in Leeds. Early reports suggested the bombers had used a military plastic explosive during the attacks on the capital's transport network.

It was later claimed that police had found acetone peroxide - a highly volatile mixture also known as "Mother of Satan" or TATP - in a bath during a raid on a property in Leeds. A security source said it appeared that home-made explosives had been found at an address in Leeds - thought to be a flat in Alexandra Grove in the Hyde Park area of the city. However, the source said police were still carrying out tests to establish its exact make-up and to see whether there was any link to the substance used by the four London bombers. Scotland Yard disclosed that more than 2,000 police officers have worked on the inquiry so far, with 500 expected to continue as permanent "core" staff.

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Officers have already analysed 6,000 CCTV tapes, but by the end of the investigation they expect to have collected a total of 25,000, according to the figures.

More than 1,000 witness statements have been taken, 3,500 documents - such as letters, phone records and bills - have been seized and police are trying to follow up information from 3,500 calls to the Anti-Terrorist hotline.. MI5 is investigating whether the London suicide bombers received terrorist training from al-Qa'ida in Pakistan after it was revealed that two travelled together to Karachi last year. Two British-born terrorists, Mohammed Sidique Khan, 30, and Shahzad Tanweer, 22, flew to Karachi on Turkish Airlines flight 1056 on 19 November last year. They left three months later on 8 February on Turkish Airlines flight 1057. Records show a third bomber, Hasib Hussain, 18, who blew up the No 30 bus, arrived in Karachi last July on a Saudi Arabian Airlines flight SV-714.