From 2013, a number of secularist writers, bloggers and publishers in Bangladesh have been killed or seriously injured in attacks perpetrated by Islamist extremists. The attacks have taken place at a time of growing tension between Bangladeshi secularists, who want the country to maintain its secularist tradition of separation of religion and state, and Islamists, who want an Islamic state. Tensions have also risen as a result of the country's war crimes tribunal, which has recently convicted several members of the opposition Islamist Jamaat-e-Islami party for crimes committed during Bangladesh's bloody war of independence in 1971. Secularists have been calling for harsher penalties for the convicted, with some calling for the Jamaat-e-Islam party itself to be outlawed, drawing the ire of the party's supporters. Responsibility for the attacks on secularists which have since occurred have been claimed by a number of militant groups including Ansarullah Bangla Team, who have frequently justified their attacks on the grounds that their victims are "atheists" and enemies of Islam. Four bloggers had been killed in 2015, but only 4 people were arrested in the murder cases.