"The (reported IS) claim is entirely baseless and Islamist militants were not involved in it...Give us just one or two days and by that time we expect the real culprits to be exposed to justice," Home Minister Asaduzzaman Khan Kamal told PTI.
A boy was killed and about 90 others injured in yesterday's blasts targeting a Shia procession in front of the community's main shrine in the Bangladeshi capital.
Kamal said the culprits planned such an attack under a well drawn up design coinciding with the Shia Muslim mourning festival of Ashura so that the incident could be attributed to the ultra Sunni IS.
"For now, I would also like to tell you briefly that all the three incidents, the murder of the two foreign nationals and the blasts at the Husseini Dalan, are interlinked... The same group of people masterminded the attack to create instability and discredit our (ruling Awami League) government," the Minister said.
They said it was believed to be the first attack on the Shias in the Sunni-dominated Bangladesh, which has witnessed an increase in violence this year claimed by the Islamic State (IS) terrorist group.
Hours after the attack, the US-based Site Intelligence Group that monitors militant threats reported that the Islamic State claimed the responsibility for the bombing on the Shia shrine.
The attack came hours after a suicide bombing at a Shia Muslim mosque in Pakistan's Baluchistan province killed at least 12 people.
Earlier too, Bangladesh authorities had rejected the claims that the IS was involved in the murder of two foreigners in the country and blamed a section of ex-prime minister Khaleda Zia's BNP-led right-wing coalition with fundamentalist Jamaat-e-Islami for the incident to create instability in the country.
The US and the UK have condemned yesterday's attacks.
