In the Aug 21 grenade attack on the Awami League rally, 24 persons were killed and hundreds wounded. Later, efforts were made to destroy the evidence of the heinous attack.
The supplementary charge sheet of this case mentions the matter of spoiling the evidence.
The supplementary charge sheet, submitted by CID officer Abdul Kahar Akhand on  Jul 3, 2011 states: “The then-DC of police Md Obaidur Rahman Khan did not take necessary security measures which allowed the  attack to take place.”
It also mentioned that an unexploded grenade, recovered from the scene, was not preserved and was destroyed without the court's permission with help from the army.
It further states that instead of ensuring quick medication for AL workers and activists, the police resorted to baton charge, lobbed tear gas and created an obstacle in sending the injured to hospitals.
The charge sheet also says that the then DMP police DC (south) Khan Sayeed Hassan, deliberately kept the security low to facilitate the attackers.
It adds that then-DMP chief and later IGP Ashraful Huda left the country in a hurry instead of taking essential security.
Despite becoming the Bangladesh Police chief, he did not take any initiative to identify the perpetrators of the attack, the charge sheet mentions.
It’s also believed that despite knowing the association of top Harkat-ul-Jihad-al-Islami, Bangladesh (HuJI,B) leader Mufti Abdul Hannan to the attack, no step was taken to arrest him and his accomplices.
“To save Mufti Hannan, the case was misdirected, as a result of which, a person called Joj Mia was arrested and a false confession was taken and recorded,” the charge sheet mentions.
When Mufti Hannan was arrested by RAB, he confessed to being involved in the grenade attack and revealed names of cohorts. But even then, he or his accomplices were not charged for the attack.
It was found that taking grenades from Mufti Hannan, Sharif Shahedul Alam Bipul carried out an attack on the then-British High Commissioner Anwar Chowdhury in Sylhet.
Assailants carried out the attack with military hardware 'arges grenades' on an anti-terrorism rally of the then-opposition Awami League while its president and incumbent Prime Minister Sheikh Hasina was visibly their prime target but she narrowly escaped the assault sustaining permanent hearing impairment.
A total of 24 AL leaders and workers, including the then Mohila Awami League President and wife of late President Zillur Rahman, Ivy Rahman, were killed and around 500 others were injured in the monstrous attack.
Fifty-two people were held accused in the case while prosecution suggested an influential quarter of the then BNP regime, including party’s Senior Vice-Chairman Tarique Rahman, masterminded the shocking plot engaging militant outfit HuJI, B and subsequently made a desperate attempt to protect the assailants.
A total of 31 accused including two former ministers faced the trial in person while 18 including Tarique were tried in absentia. Tarique, now in London, and 17 others including several intelligence officials were earlier declared “absconding” as they were on the run to evade justice.
Eight suspects including three former police chiefs were on bail as the trial was underway while the court on Sept 18, scrapped their bails and ordered their confinement in jail with due facilities they deserved under the law.
Three of the accused, including HuJI,B leader Mufti Hannan, however, have been executed after trials in other cases.