Asian stocks fell, with the regional benchmark index set for its first loss in four days, after levels of iodine unsafe for infants were reported in Tokyo tap water as workers struggled to reconnect power to a damaged nuclear reactor.Tokyo Electric Power Co. slumped 4.5 percent after rising as much as 7 percent before a Tokyo official warned against giving infants tap water to drink. Toyota Motor Corp., the world’s biggest carmaker, declined 1.2 percent after extending production halts. Virgin Blue Holdings Ltd. plunged 6.1 percent in Sydney after Australia’s second-largest airline forecast an annual loss. China Coal Energy Co. slumped 9.1 percent in Hong Kong after earnings missed estimates.“Investor focus has moved to the medium-term consequences of the natural disaster to the Japanese and...