Hannan, 60, was hanged last night at Kashimpur Jail in Gazipur along with his accomplice Sharif Shahedul alias Bipul, Home Minister Asaduzzaman Khan said.
His associate Delwar Hossain Ripon was executed in Sylhet jail, the minister added.
The bodies of the three were taken to their family plots in Moulvibazar, Chandpur and Gopalganj immediately after their sentences were carried out.
Hannan's older brother Moulana Aliuzzaman Munshi received the body, Kamrul Farooq, police official at Kotaliparha, was quoted as saying by the bdnews.
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Bipul, an accomplice of Hannan, has been buried at his family's plot in Chandpur Sadar Upazila's South Moishadi village.
Bipul's body was buried immediately after funeral prayers upon its arrival today, said Moishadi Union Parishad Chairman Moniruzaaman Manik. Bipul is survived by his wife and 9-year old son.
The body of Ripon has been buried near his ancestral home in Moulvibazar. The funeral prayers were held at the Brahminbazar Union Konagaon village Eidgah field around 2:30 pm on Thursday. The body was then buried at a grave near the Eidgah field.
Hannan, who studied in India and Pakistan, had fought against the Soviets in Afghanistan before returning to join HuJI, media reports said.
On March 19, the Supreme Court reconfirmed its earlier verdict, endorsing death penalty to Hannan and the two others for the 2004 attack on the then UK envoy.
The then Bangladeshi born British High Commissioner Anwar Chowdhury narrowly escaped the grenade attack at a shrine in northeastern Sylhet that killed three people, all policemen, and injured 70 others. Anwar sustained minor injuries.
Hannan and seven other kingpins and operatives of Huji were earlier sentenced to death by another court in Dhaka for a deadly 2001 bomb attack that killed 10 people during Bengali New Year celebrations at a public park.
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