2004 Dhaka grenade attack

The Awami League called for a nationwide hartal on 23 and 24 August 2004 following the incident. Khaleda Zia, then Prime Minister of Bangladesh condemned the attacks, and also vowed a thorough probe to catch the culprits.[7] An intercity train was burned down by Awami League activists on strike in Bhairab. Awami Leagues activists also organized protests in Chittagong and furled black flags at the sight of the attack. A funeral service for the victims at Baitul Mokarram National Mosque was attended by 20 thousand people.[8] Protests in Dhaka were attacked by members of Bangladesh Police and Jatiyatabadi Sramik Dal, the workers wing of Bangladesh Nationalist Party. The Jatiyatabadi Sramik Dal activists also attacked and injured six members of the press.[9]

President of the United States, George W. Bush, expressed "shock" at the attack and conveyed his message to Prime Minister Khaleda Zia and Opposition leader Sheikh Hasina through the Secretary of State of the United States, Colin Powell. The attack was also condemned by the United Kingdom, Netherlands, Denmark, France, Germany, Italy, and Sweden.[10]

Bangladesh Police refused to register any criminal case filed by Bangladesh Awami League over the attack and only registered a general diary.[8] The government initially refused to hand over the bodies of the victims.[11] Investigators from the Federal Bureau of Investigation and Interpol made repeated visits to Bangladesh to provide technical support.[12] The Government also tried to implicate Mokhlesur Rahman, an Awami League activists, and Shaibal Saha Partha. They were arrested by Bangladesh Police.[12][13] Shaibal Saha Partha and Joj Miah were tortured in custody and forced to give a false confessional statement.[14] An investigation by the Supreme Court Bar Association accused the government of destroying evidence. The government was also criticised for hurriedly burying two unidentified dead bodies from the terror attack in the middle of the night.[12]

In 2004, the Bangladesh Nationalist Party-led alliance government assigned the Crime Investigation Department of the police to foresee the investigation. They came up with a story that some Joj Miah, also known as Jamal Ahmed from Noakhali district, along with 14 other criminals of Seven Star terrorist group of Subrata Bain attacked the Awami League rally. They met at Moghbazar before the attack, and rehearsed at a remote island before the attack.[15] The government of Bangladesh formed a one-man judicial probe led by Justice Joynul Abedin. The Awami League rejected the commission which blamed the attack on a neighboring country. The Daily Star described Abedin as a "shame" for the judiciary in Bangladesh.[16]

On 26 June 2005 Joj Mia, a petty criminal, confessed his involvement in the crime under section 164, to the magistrate. The story collapsed following investigative journalism who discovered holes in the official story.[16]

In 2007, after the military-backed government assumed office, many of the BNP and Awami League leaders were rounded up by the government agencies, and fresh investigation into the case was launched.

After almost one year, in November 2007, Mufti Hannan, a militant leader from Gopalganj who was arrested by the BNP-led government in 2005, revealed that the attack was operated by the militant outfit Harkat-ul-Jihad-al-Islami of which he was a leader. He also admitted that he got support from Maulana Tazuddin, brother of BNP leader and former deputy minister Abdus Salam Pintu while coordinating the attack.[17]

According to his statement, Abdus Salam Pintu had knowledge of the attack.

In 2008, after the detailed investigation, the then CID high official Mohammad Javed Patwary concluded that the attack was aimed at killing Sheikh Hasina and was guided by the common grievance of both Mufti Hannan and Abdus Salam Pintu against Sheikh Hasina for her role in "subduing" Islam. The investigation report mentioned that, Abdus Salam Pintu was personally responsible for the attack.

In 2009, Awami League came to office and decided to launch a further investigation into the incident and appointed a retired CID official Abdul Kahar Akhand as the person in charge.

In the same year, Abdul Majed Bhat alias Yusuf Bhat gave a confessional statement with the details regarding the source of grenade used in the attack. He claimed that Muzaffar Ahmad Shah of Tehrik-e-Jihad Islami (TEJI) gave the grenades to Maulana Tajuddin to send those to Indian militant groups. Tajuddin, instead of sending those to India, kept those with him. According to Yusuf Bhat, these grenades were later handed over to Mufti Hannan to carry out the attack.[18]

After two years, in 2011, Mufti Hannan gave another confessional statement implicating many big names, mostly BNP leaders and some former officials of the government including the son of opposition leader and former prime minister Khaleda Zia, Tarique Rahman, former deputy minister Abdus Salam Pintu, former member of parliament Kazi Shah Mofazzal Hossain Kaikobad and some officials of the Home Ministry, police, Directorate General of Forces Intelligence (DGFI), National Security Intelligence (NSI) and Prime Minister's Office (PMO) with involvement in the planning of the bombing.

In the statement, Mufti Hannan claimed that the attack was aimed at destroying the top leadership of Awami League including Sheikh Hasina, and BNP leader Tarique Rahman along with Jamaat leader Ali Ahsan Mohammad Mujahid and the then Home Minister Lutfuzzaman Babor assured them with government support.