A coalition of secularist advocacy groups originally planned to rally in London and several cities in the U.S. and Canada over the arrests of four atheist bloggers who were charged with blasphemy in the officially Muslim nation.

Some of the protests were postponed until May 2 after Bangladesh declared Thursday a day of mourning for the victims of Wednesday’s collapse.

Thursday’s rallies in Washington D.C., New York and Columbia, Mo. were scheduled to go on as planned, but rallies in London, Ottawa, Calgary, Toronto and Dhaka were pushed back until May 2.

The U.S. groups — led by American Atheists and the Secular Coalition for America — decided to continue with protests as originally planned, while the International Humanist and Ethical Union, the U.S. and Canadian branches of the Center for Inquiry, and the British Humanist Association decided to postpone.