Reporting from Tokyo, Koriyama and Fukushima ---—The number of missing and feared dead in Japan's epic earthquake soared Sunday as a reeling nation struggled to contain an unprecedented nuclear crisis, pluck people in tsunami-inundated areas to safety, quell raging blazes and provide aid to hundreds of thousands of frightened people left homeless and dazed.
A police chief in the battered Miyagi prefecture told disaster relief officials that he expected the death toll to rise to 10,000 in his prefecture alone, the Kyodo News Agency said.
Photos: Scenes from the earthquake
The country's chief Cabinet secretary, Yukio Edano, was quoted by a news agency as saying that a meltdown may have occurred in at least one nuclear power reactor and that authorities are concerned about the possibility of a meltdown at a second reactor.
"Even if a blast were to occur in the building containing the [other] reactor, the government doesn't think the levels of radiation would affect the health of residents who have evacuated the area," Edano said. "But the fact that we can't rule out the possibility of a blast is likely to cause some concerns."
Dozens of people were believed to have been exposed to elevated levels of radiation, but officials sought to reassure the public that there was no significant health risk to the general population, even though cesium and iodine, byproducts of nuclear fission, were detected around the plant. The incident could rank as the worst atomic accident in Japan's roughly half-century of nuclear power generation.
Videos of the earthquake
"Everybody in my neighborhood is being evacuated," said Teruko Tsuchiya, 53, who lives four miles from the nuclear plant and was lining-up outside a 7-11 convenience store waiting for food. "The buses are going back and forth. People are scared of course but they are trying to stay calm and it is proceeding in an orderly fashion."
Tsuchiya said people had enough blankets to get through the frigid nights, but worried many would start going hungry.
With punishing aftershocks continuing to jolt the quake zone, the Japan Meteorological Agency revised the magnitude of the earthquake to 9.0, Kyodo News agency said. The upgrade made the quake one of the largest ever recorded in terms of magnitude.
Adding to the urgency of rescue efforts, the agency said there was a 70% probability of a magnitude-7 quake in the next three days.
The Japanese military was mobilizing 100,000 of its personnel, together with ships and planes, for a rescue effort that is a race against time. In a country where every modern convenience has long extended into even remote areas, the basics of daily survival -- food, water, power -- were unaccustomedly threatened.
Even in Tokyo, where the damage was limited, the rhythms of a normally throbbing metropolis were stilled. In many central districts, the trademark neon blaze was absent on streets that were eerily deserted. The subway system was running again, if sporadically, but on a Saturday evening, when its cars would normally be packed with passengers, some slid through stations all but empty, like ghost trains.
As of early Sunday, the confirmed death toll stood at 963, the Kyodo agency reported, citing police figures. It's unclear if that included another 200 to 300 unidentified corpses, mostly tsunami victims, that had been transported to Sendai, the hardest-hit big city.
"It is believed that more than 1,000 people have lost their lives," Edano said.
But assessments of the disaster were far from certain. Although the official missing tally stood at 650, in Miyagi prefecture north of Tokyo, officials said Saturday night that there had been no contact with about 10,000 people in the small town of Minamisanriku, more than half its population.
Some people decided to try to get more information about missing relatives on their own. When Tokyo office worker Yuki Ochiai, 25, heard that three-quarters of the 24,000 people living in the northern coastal town of Rikuzentakata were unaccounted for, he headed north to find out the fate of family living there. He rode his motorcycle because roads were impassable by car.
"This is crazy," he said as he stopped to buy water and gas outside of Fukushima, still far from his destination. "One place. The other 18,000 people, they don't know where they are?"