FUKUSHIMA, Japan – The number of missing and feared dead in Japan’s epic earthquake soared early today as a reeling nation struggled to contain a nuclear crisis, pluck people in tsunami-inundated areas to safety, quell blazes and provide aid to hundreds of thousands of people left homeless and dazed. As the second full post-quake day dawned, authorities said about 400,000 people had been forced to flee the giant swath of destruction, more than a quarter of them evacuees from the area surrounding the Fukushima nuclear complex, 150 miles north of Tokyo. The crisis intensified as officials reported that three of the six reactors at the Fukushima No. 1 plant were in trouble and emergency measures were being taken to cool them.