Seven persons including lawyers Amjad Hossain and Golam Faruk were killed on the spot 60 people were injured in the bombing.

Gaibandha police confirmed Asadul's identity yesterday, about four months after the carnage.

Asadul who used four nicknames as Zafar, Nasir, Jahid and Ziaur hailed from Tindaha village in Ramchandrapur union in Gaibandha Sadar Upazila. His identity has been confirmed after interrogating some JMB (Jamaatul Mujahideen Bangladesh) cadres and his parents, police said.

During investigation, Asadul's father bicycle mechanic Abdur Rahim and mother Ayatunessa and relatives identified his photograph.

Police also recovered copies of JMB monthly journal Al-Magazi, other papers and Jihadi (militancy) books from the house of Asadul.

Quoting family sources, police said Asadul read up to class eight at Trimohoni High School and later went to Bogra for studying in a madrasa. Since than, he did not keep any contact with the family.

CID investigation officer Shamol Kumar during investigation quizzed Adnan alias Abbas, arrested 'regional commander' of JMB for Bogra and Joypurhat districts. Adnan unidentified that the Gazipur suicide bomber was Asadul Islam.

Asadul was assigned to do the suicide bombing by JMB chief Shahikh Abdur Rahman through two 'regional commanders' Adnan and Reaz, both now in custody, police said.

After the incident, Sub-Inspector Alamgir of Gazipur police station filed two cases, one for murder and another under the Explosives Act without identifying the perpetrators.

The FIR report said that the unidentified person whose body was found at the spot was a suspected member of JMB suicide squad and that he might have done the bombing.

Based on confession of Adnan, CID investigators further quizzed Ziaur Rahman alias Badal alias Reaz in Gaibandha jail. He was arrested by Rapid Action Battalion (Rab) from Ayub Ansari Jame-Mosque near Gaibandha circuit house in December.

During interrogation Reaz confessed that the JMB cadre who killed himself in Gazipur suicide bombing was Asadul Islam of Tindaha village in Gaibandha Sadar upazila.