The convict is Mawlana Abdul Aziz alias Hanif, a local leader of JMB.
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Sylhet Additional Metropolitan Magistrate Court Judge Mominunessa delivered the verdict.
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Charges were framed in the case on May 27, 2014.
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According to the case statement, on August 19, 2005, militants of JMB exploded series bombs at 29 spots including 12 important ones of Sylhet, leaving 15 people, including a Judge of Speedy Trial Tribunal, injured.
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Police later filed 29 separate cases over the blasts under the Special Powers Act and most of them are still under trial.
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