“Two weeks after the 7/7 attacks, on July 21, 2005, a second wave of hydrogen-peroxide-based bombs was set off in London, this one organized by a cell of Somali and Eritrean men who were first-generation immigrants. …Fortunately, while four bombs were set to detonate on 7/21–three on the London Underground and one on a bus, mimicking the attacks two weeks earlier–their faulty construction rendered them harmless.”
– Peter Bergen, The Longest War, Page 200