Nuclear Tsunami

Nuclear Tsunami - Rescuers scramble to save lives as aftershocks jolt Japan. A frantic scramble for survivors of Japan's strongest-ever earthquake -- which unleashed a wall of seawater that decimated entire neighborhoods -- stretched into a third day Sunday as rescuers dug through mud and rubble to find the buried, both alive and dead.

On Saturday, dazed survivors were plucked from collapsed homes, muddy water and burning debris. Japanese Prime Minister Naoto Kan said more than 3,000 people were rescued, according to the country's Kyodo News Agency.

While the official death toll from Japan's National Police Agency was at 686, with 642 missing, the actual toll is thought to be much higher, with Japanese public broadcaster NHK reporting more than 900 dead and Kyodo News Agency saying the death toll could top 1,800.

The number is expected to rise as rescuers reach more hard-hit areas. In one costal town alone -- Minamisanriku, in Myagi Prefecture -- some 9,500 people, half the town's population, were unaccounted for, Kyodo reported.