Bangladesh has launched a major evacuation operation as Cyclone Mocha, a dangerous category four storm, threatens the country. The cyclone, expected to weaken before making landfall, poses a severe threat to coastal areas, including Cox's Bazar, home to the world's largest refugee encampment. Authorities have already moved around 190,000 people in Cox's Bazar and nearly 100,000 in Chittagong to safety. Additionally, 55 shelters have been set up on the Bhasan Char offshore island, where Rohingya refugees have been relocated. Fishing boat operators in the Bay of Bengal have been instructed to stay close to the shore.