The influence of conservative Sunni Islam 'revivalism' has been noted by some. On 5 May 2013 a demonstration organized by the Hefazat-e-Islam movement paralyzed the city of Dhaka when half a million people demanded the institution of a conservative religious program, to include a ban on mixing of men and women in public places, the removal of sculptures and demands for the retention of "absolute trust and faith in Almighty Allah" in the preamble of the constitution of Bangladesh. In 2017 author K. Anis Ahmed complained that attacks on and killings of liberal bloggers, academics and religious minorities, had been brought about by "a significant shift ... in the past few decades" up to 2017 in attitudes towards religion in Bangladesh.