Rauf wrote that Haji arranged for a trainer called Marwan Suri to provide bomb-making training using hexamine peroxide detonators and hydrogen peroxide.

CNN: Documents give new details on al Qaeda's London bombings

Rauf described how the duo then began purchasing bomb components, including hydrogen peroxide in gardening stores, hexamine in camping stove fuel and citric acid, which was easily available.

CNN: Documents give new details on al Qaeda's London bombings