As East Pakistan struggled to become the separate state of Bangladesh during the 1971 Bangladesh Liberation War, the political and military turmoil and associated atrocities led to a massive refugee problem, with at least 7 million displaced people pouring into neighbouring India. East Pakistan had recently endured devastation as a result of the Bhola cyclone, and the Bengalis' desperate plight increased in March that year when torrential rains and floods arrived in the region, threatening a humanitarian disaster. Quoting figures available at the time, a "Rolling Stone" feature claimed that up to half a million Bengalis had been killed by the cyclone in November 1970 and that the Pakistani army's subsequent campaign of slaughter under Operation Searchlight accounted for at least 250,000 civilians, "by the most conservative estimates". Following the mass exodus to Calcutta, a new threat arrived as the refugees faced starvation and the outbreak of diseases such as cholera.