It's a sad day for online activists in Bangladesh. On Tuesday morning, science writer and blogger Ananta Bijoy Das was murdered by a group of three or four masked people wielding machetes  in Sylhet, Bangladesh's fifth largest city.
It was the third such killing this year of a writer who advocated secular thought, allegedly at the hands of religious extremists.
Das, 33, was a banker by profession but also edited a quarterly magazine called Jukti (Logic) and headed the Sylhet-based Science and Rationalist Council. He was the author of four books on science and critical thinking, and took an active part in the Ganajagaran Mancha, a forum born out of the Shahbag protests that demands a ban on Islamist parties and the death penalty for convicted war criminals.
Das was also an admin for the Bangla blog Mukto Mona (Free Thinkers), which won Deutsche Welle's prestigious BOBS award  for social change in April 2015.
According to the Doha Centre of Internet Freedom :
While most of Das's output for Mukto-Mona focused on science and evolution, he wrote a number of blogs that criticised some aspects of Islam and also of Hinduism.
In comments on Facebook posted early Tuesday, Das slammed the local member of parliament from the ruling Awami League party for criticising one of the country's top secular and science fiction writers.
Bangladesh, a Muslim-majority country, is officially secular. But people who have challenged religion have repeatedly been targeted by Islamic extremists in the past decade .
The nature of the threats have also escalated from local to international. Just a week ago, Al Qaeda in the Indian Subcontinent (AQIS) claimed responsibility  for the assassination of Bangladeshi-American blogger Avijit Roy  (the founder of Mukto Mona blog) on February 26 in which his wife Rafida Ahmed was badly injured. In a recent interview, she slammed Bangladesh's government for inaction and has termed the attack on her husband  as “well planned, choreographed – a global act of terrorism.”
On March 30, another blogger who opposed irrational religious belief, Washiqur Rahman, was hacked to death  in Dhaka. Two madrassa (Islamic religious school) students were apprehended and a third assailant got away. Both Roy and Rahman's cases are under trial.
Das had been on extremists’ hit list for some time and was first named in a list of 84 bloggers  deemed atheist or blasphemous by Islamic hardliners submitted to the government in 2013.
Outrage over Das’ death spread quickly. Prominent blogger Arif Jebtik  wrote on Facebook:
লিখতে, বলতে, ভাবতে কোনো কিছুতেই আগ্রহ পাই না। ৮৪ জনের একটি তালিকা স্বরাষ্ট্র মন্ত্রণালয়ে জমা পড়েছিল দুইবছর আগে, তালিকা থেকে নবম হত্যা হয়েছে আজকে সিলেটে। তালিকা নিশ্চয়ই চূড়ান্ত নয়, গত ২ বছরে আরো নাম সেই তালিকায় নির্ঘাত যুক্ত হয়েছে। কিন্তু অন্তত এই ৮৪ জনের ব্যাপারে গত ২ বছরে কোনো খোঁজখবর হয়নি, তাঁরা নিয়মিত বিরতিতে খুন হওয়া শুরু করেছেন।
মাসিক কোটায় হত্যা শুরু হয়েছে হয়তো এটি সপ্তাহান্তের কোটায় উন্নীত হবে। ৮৪ জন যাবে, আরো হাজার চুরাশির নাম তালিকায় আসবে। খানিক আহাজারি হবে, সবখানেই একটা ফিসফিস-চুপচুপ ভাব, কিছু বিকৃত মানুষের উল্লাস-তারপর পরের হত্যার জন্য অপেক্ষা।
এই দেশে আইনবহির্ভূত সব হত্যাই জায়েজ হিসেবে মেনে নিয়েছে বৃহত্তর জনগোষ্ঠি, এখানে সবগুলো খুনই ‘বিচ্ছিন্ন ঘটনা'।
I don't have the impetus to write, say or think anything. Two years ago a list of 84 bloggers was submitted to the Ministry of Home, 9th from the list was murdered today in Sylhet. This list is not exhaustive, surely more names have been added in the past two years. But nobody bothered to think about the safety of these 84 individuals. They are ending up dead one by one, in regular intervals. Now they are killing one every month, maybe they will speed up to do the same weekly. This list will be done, thousands more will be added. People will regret the death a bit, hush, silence everywhere, demonic joy from some perverts, then everybody waits for the next kill. In this country all these illegal killings have been taken for granted, every death is an isolated incident.
Blogger and activist Rayhan Rashid remembered the fallen who were attacked or killed for their free thinking in Bangladesh:
— Rayhan Rashid (@rayhanrashid) May 12, 2015 
— Bidit (@bidit76) May 12, 2015 
— Rana Meher (@Rana_Meher) May 12, 2015 
Ananta Bijoy Das's last posts were translated from Bengali to English  by Arunava Sinha:
— Arunava Sinha (@arunava) May 12, 2015 
The International Humanist and Ethical Union (IHEU)  wrote in a blog that Ananta Bijoy Das's application for a visa to travel to Sweden, under invitation from Swedish PEN to speak in a conference, was rejected recently by the Swedish embassy in Dhaka, on the basis that he might seek to remain in Sweden.
Exiled writer and columnist Taslima Nasrin  blamed the government:
Bangladesh government is not taking any action against the Islamist-killers for being afraid to be labelled as anti-Islam. Islamists are allowed to do whatever they like in Bangladesh. It seems killing free-thinker atheists who criticize Islam is their main agenda.
A.K.M Shafiur Rahman
Washikur Rahman Babu
Ananta Bijoy Das.
Who is next?
Tomorrow maybe you. Or maybe me.
Blogger Haseeb Mahmud  wrote:
পুলিশের দায়িত্ব কি সেটা এই মুহুর্তে একটা প্রশ্ন। অভিজিৎ হত্যার কোন সুরাহা হয়নি। ব্লগার রাজিব হত্যার মামলায় গ্রেফতার ও সেটার বিচার শুরু হলেও সেই হত্যাকান্ডের নাটের গুরু এখনো ধরা ছোঁয়ার বাইরে। অনন্ত বিজয়ের হত্যাকারিদের গ্রেফতার ও তাদের রাতারাতি বিচার শুরু হবে এটাও আশা করা কঠিন। আমাদের করণীয় চাপাতির মুখে লেখা না থামানো। লেখা থামালে জিতে যাবে আনসারুল্লাহ।
What the responsibility of the police is at this point is a question mark. They could not find the killers of Avijit Roy. They have arrested the killers of blogger Rajib, but the mastermind is on the loose. It is a tough to hope that the killers of Ananta Bijoy will be nabbed anytime soon or a trial will start. Our prerogative is to not to stop writing even if confronted by wielding machetes. If we stop writing they will win.