"He (Nizami) has been brought here (Dhaka Jail) last night as part of the process to execute the Supreme Court verdict. We are prepared to carry out the process in Dhaka Central Jail," a senior prison official said.
He said the 73-year-old top leader of Bangladesh's biggest Islamist party was kept in an isolated cell in the prison "as per procedure".
Prison authorities, however, were still waiting for the copy of the Supreme Court judgement.
Nizami's final appeal against his death sentence for war crimes committed during the 1971 Liberation War against Pakistan was rejected by the Supreme Court on May 5.
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He was brought to the capital in a special prison van escorted by a number of police vehicles from the Kashimpur Central Jail.
According to witnesses, security vigil was intensified overnight around the prison in the old part of Dhaka with elite anti-crime Rapid Action Battalion (RAB) forces deployed along with police in riot gear.
Nizami lost exhausted his legal options on May 5 when the Court reconfirmed his death penalty, upholding its previous judgement that had confirmed his death sentence.
Family members met him the next day at suburban Kashimpur Central Jail.
Nizami, a former lawmaker and minister in ex-prime minister Khaleda Zia's cabinet, has been in jail since 2010, when he was arrested to be tried 1971 war crimes in the ICT-BD which handed him down death penalty on October 29, 2014 on charges of mass murder, arson, loot and rape.