Meltdown threat rises at Japanese nuclear plant

Monday, March 14, 2011 | 12:11 p.m. CDT; updated 9:15 p.m. CDT, Thursday, March 17, 2011

SOMA, Japan — Water levels dropped precipitously Monday inside a stricken Japanese nuclear reactor, twice leaving the uranium fuel rods completely exposed and raising the threat of a meltdown, hours after a hydrogen explosion tore through the building housing a different reactor.