NEW : U.N. is increasingly worried about flood-driven malnutrition among children . The floods seem determined to outrun our response , '' he said . U.N. official says a `` colossal disaster is getting worse '' About 1 million additional people have been displaced in Sindh province , the U.N. says . The United Nations has warned that more than half of Pakistan's population could be affected by floods this year.
NEW : U.N. is increasingly worried about flood-driven malnutrition among children . U.N. official says a `` colossal disaster is getting worse '' About 1 million additional people have been displaced in Sindh province , the U.N. says . The United Nations has warned that more than half of Pakistan's population could be affected by floods this year.