On 4 April 2013 (0700 GMT) all Bengali blogs were blacked out for an indefinite time to protest the arrest of four bloggers in Bangladesh (Moshiur Rahman Biplob, Rasel Parvez, Subrata Adhikari Shuvo and Asif Mohiuddin). The blackout was to back a demand for the unconditional release of the arrested bloggers. A fundamentalist group named Hefajat-e-Islam Bangladesh started a campaign to hang freethinking bloggers, and demanding tough blasphemy laws. In response, the government started monitoring Bengali blog sites and sending letters to their authorities to terminate the alleged "anti-religious" blogs and provide information about the alleged "anti-religious" bloggers. Individual bloggers showed their solidarity with this blackout by changing their profile photos on Facebook and by tweeting