The plan to kill the current Prime Minister Sheikh Hasina was the family decision of Zia family. Discussion about Sheikh Hasina`s assassination has been discussed in their family meeting. Tarique Zia commented that time Sheikh Hasina should get her father`s fate. In that family meeting, Begum Khaleda Zia, her elder brother, her elder sister Khurshida Jahan Haq Chocolate, her younger son late Arafat Rahman Koko and Tarique Zia`s close friend and business partner Giasuddin Al Mamun were also present. Mamun is now serving in prison after getting convicted in several corruption cases. The military backed caretaker government led by Fakhruddin Ahmed arrested Mamun in 2007. After the arrest on April 12, 2007, Mamun confessed details about his corruption, his relationship with Tarique Zia and BNP`s politics to the detectives. Mamun also informed about the plan to assassinate Awami League president in his statement.
According to the sources, Giasuddin Al Mamun had said in his statement that "Awami League government came to power under the leadership of Sheikh Hasina in 1996 after 21 long years. Tarique Zia could not tolerate Sheikh Hasina. After the formation of `Hawa Bhaban`, Tarique Zia started thinking of removing Sheikh Hasina from politics as part of a political strategy." Mamun also said in the confessional statement given to the military detectives, "I told him that it would be a bad precedent. Rather, you defeat her by politics."
Mamun said in his deposition that after BNP came to power in the year 2001, the idea of removing Sheikh Hasina came again on Tarique`s mind. Tarique told everyone about his thoughts at the dinner table. Everyone including Begum Zia advised Tarique to contact someone to do this task. Mamun claimed that Abdus Salam Pintu was made Deputy Minister for doing this work. Mamun said, "Tarique planned to conduct such attack in Sudha Sadan, Dhanmondi since the house was completely near to Dhanmondi Lake. But ultimately the militants told Tarique that it would not be realistic. Tarique Zia even planned to attack Sheikh Hasina`s convoy. But, finally, the plan for the grenade attack in the public rally was finalized. Mamun said in interrogation, "If it is possible to remove Sheikh Hasina, it will be possible to establish perpetual power for BNP. There was no alternative plan on his mind."
It is known in the investigation, the caretaker government led by Dr Fakhruddin Ahmed started re-investigation of the 21 August grenade attack case based on Mamun`s statement. Then the government arrested Abdus Salam Pintu. After that the main conspiracy had been revealed. And according to the statement, the verdict of the August 21 grenade attack case has finally been pronounced on October 10, 2018.