By the time the 12-hour siege ended on July 2 inside a Bangladesh restaurant, as many as 22 people plus six militants were reported dead.
A secular activist, who received death threats from Islamist militants in Bangladesh, was recently granted asylum in Germany.
Police arrested four members from a banned militant group, who are suspected of having hacked to death a professor in northwestern Bangladesh.
Another secular activist was murdered in Bangladesh after he posted comments against growing Islamism in the country on his Facebook page last month.
Bangladesh is considering dropping Islam as its official religion following a spate of extremist attacks against adherents of other denominations.
A Hindu priest was slain and a devotee wounded in Bangladesh last month in the latest attack on religious minorities in the largely Muslim nation.
Bangladeshi police have arrested two individuals from a banned Islamist group for their involvement in the murder of yet another secular blogger.
Attacks on atheist bloggers who are critical of Islam have developed a disturbing frequency in Bangladesh, with yet another gruesome killing
Police officials in Bangladesh have charged four suspects with the murder of another atheist blogger, who was earlier accused of mocking Islam.
Police officials in Bangladesh said religious extremists were behind the recent killing of secular blogger Avijit Roy.
