The Holey Artisan Bakery and O' Kitchen restaurant in the upmarket Gulshan area was opened for the relatives and public to pay respects to the 22 people, including an Indian girl, killed in the attack.
Representatives of various political parties including the ruling Awami League, opposition Bangladesh Nationalist Party, and various civil society groups and police personnel paid their respects and laid flowers at the site.
They then brutally killed the hostages with guns and machetes. An Indian woman was among the 22 victims.
Around 12 hours later, para commandos stormed the restaurant. Two police officers were killed in the attack claimed by the Islamic State.
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Eight suspects who were involved in its planning died in several anti-terror raids that followed. Four have been captured alive, while five more remain at large.
Officials familiar with the investigations said they found evidence that 21 people were involved in the attack.
"Some 70 militants were gunned down or blew themselves up during encounters with police in the past one year. We have also arrested 128 suspected militants," police spokesman Quamrul Islam said.
But several analysts, however, said despite intensified security clampdowns after the July 1 attack, no visible progress has been made in investigations.
Home Minister Asaduzzaman Khan earlier this week said despite being late, the investigating agency would submit a "flawless" charge-sheet in the Holey Artisan attack case.
"We will take the case very seriously so that the trial proceedings are completed within the shortest possible time," Alam added.
The Bangladeshi government has arrested several militants after the cafe siege, but denies the existence of the Islamic State in the country and blames home-grown groups for the attack.
Analysts believe that the IS may not be physically present in the country, but is involved in propagating jihadist ideologies and contributing to radicalisation and the recruitment of jihadists by domestic extremist groups.
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