Dhaka, Feb 28 (ANI): Social activists in Bangladesh took to streets to protest after machete-wielding assailants hacked to death a blogger in Dhaka, in the latest of a series of attacks on writers who support free thinking values in the Muslim-majority nation. Avijit Roy, a U.S. citizen of Bangladeshi origin, and his wife and fellow blogger, Rafida Ahmed, were attacked on February 26 while returning from a book fair. Ahmed was seriously injured. Spokesperson of a secular platform, Ganajagaran Mancha, Imran H. Sarkar demanded stringent punishment for the assailants. A social activist Khushi Kabir said that killing of Roy meant killing of freedom of thought. Police retrieved two machetes from the site, but have not yet identified any suspects.