Russia's chemical weapons chief killed in Moscow bomb blast

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Crude bombs were first used by revolutionaries in West Bengal in the early 1900s to fight the British. They gradually became an accepted feature of the state's politics, most notably in the 1960s as Maoist rebels fought for control of the state. Since then, bomb-making skills have been passed down the generations. Pankaj Datta is West Bengal's former Inspector General of Police.