Pakistan's floods, the worst to hit the country in 80 years, will cause "major harm to the economy," the International Monetary Fund said on Monday as donors' and investors' concerns grew over the disaster's impact on an already fragile economy. The floods "are very likely to cause major harm to the economy in terms of loss of output and budgetary consequences," an IMF spokesman told media. "In these circumstances, support from the international community will be critical." The spokesman did not say whether the economic impact could affect Pakistan's $11.3 billion IMF program, but he said IMF officials were in touch with the authorities to assess the situation.