Theatre troupe Swapnadal and Bangladesh Shilpakala Academy jointly observed Hiroshima Day on Thursday at the Experimental Theatre Hall through various programmes. Marking the 68th anniversary of the tragic events of Hiroshima-Nagasaki, the programmes included an anti-war poster and photography exhibition at the lobby of the hall, distribution of paper cranes in memory of Japanese child Sadako Sasaki — the symbol of trauma of war — followed by a brief discussion.