Jihadist threat monitoring group SITE Intelligence Group claimed in a report on Tuesday that a Bangladeshi suicide bomber had called on his "Muslim countrymen to immigrate for jihad or carry out lone-wolf attacks in Bangladesh" prior to completing his fatal mission.
And in a Facebook post on Wednesday, Independent World Report editor Tasneem Khalil claimed the suicide bomber was called Abu Maryam al-Bengali in Arabic and had died in Tikrit, Iraq.
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The revelations have the potential to embarrass the Bangladesh government, which has repeatedly denied the presence of Islamic State (IS) in the country and describes the IS-affiliated group New JMB as a faction of the Shayakh Abdur Rahman-led militant outfit which surfaced in 2015.
State Minister for Foreign Affairs Md Shahriar Alam said on Tuesday that IS and other international terrorist outfits did not exist in Bangladesh and that there was no evidence to support the claim that homegrown militants had links to foreign groups.
While on Monday, the Inspector General of Police (IGP) AKM Shahidul Hoque claimed once again there was no IS in Bangladesh while refuting comments made by a visiting terrorism analyst at an international police chiefs conference in Dhaka.
Prof Rohan Gunaratna had said that Bangladesh Police needed to "tell the truth about IS involvement" in the July 1, 2016 terrorist attack on the Holey Artisan Bakery in Gulshan that killed 23 people, including 17 foreigners.
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SITE was the first organisation to report that IS had claimed credit for the Gulshan attack - the country's deadliest.
In a video released five days following the attack, IS hailed the operation and called for jihad in Bangladesh. The video, which featured three Bangladeshi men, also threatened more attacks on "crusaders" and "crusader nations".
On July 7, the Eid Day, militants linked to the Gulshan attackers swooped on the police near Sholakia Eidgagh ground. IS, however, did not claim responsibilities this time.
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Their last video released in September showed the five terrorists of Gulshan attack making statements to justify their stance, criticising the democratic system and political leaders.
Since September 2015, the Syria-based Salafist group claims their supporters in Bangladesh have carried out 26 attacks.