Reuters: Japan confronted devastation along its northeastern coast on Saturday, with fires raging and parts of some cities under water after a massive earthquake and tsunami that likely killed at least 1,000 people.
Daybreak revealed the full extent of the damage from Friday's 8.9 magnitude earthquake -- the strongest in Japan since records began -- and the 10-metre high tsunami it sent surging into cities and villages, sweeping away everything in its path.
"This is likely to be a humanitarian relief operation of epic proportions," Japan expert Sheila Smith of the U.S.-based Council on Foreign Relations wrote in a commentary.
In one of the worst-hit residential areas, people buried under rubble could be heard calling out "help" and "when are we going to be rescued", Kyodo news agency reported. TV footage showed staff at one hospital waving banners with the words "Food" and "HELP" from a rooftop.
In Tokyo, office workers who were stranded in the city after the quake forced the subway system to close early slept alongside the homeless at one station. Scores of men in suits lay on newspapers, using their briefcases as pillows.
The government warned there could be a small radiation leak from a nuclear reactor whose cooling system was knocked out by the quake. Prime Minister Naoto Kan ordered an evacuation zone around the plant be expanded to 10 km (6 miles) from 3 km. Some 3,000 people had earlier been moved out of harm's way.
Underscoring concerns about the Fukushima plant, 240 km (150 miles) north of Tokyo, U.S. officials said Japan had asked for coolant to avert a rise in the temperature of its nuclear rods, but ultimately handled the matter on its own. Officials said a leak was still possible because pressure would have to be released.
The unfolding natural disaster prompted offers of search and rescue help from 45 countries. China said rescuers were ready to help with quake relief while President Barack Obama told Kan the United States would assist in any way.
The northeastern Japanese city of Kesennuma, with a population of 74,000, was hit by widespread fires and one-third of the city was under water, Jiji news agency said on Saturday. The airport in the city of Sendai, home to one million people, was on fire, it added.

Boats, cars and trucks were tossed around like toys in the water after a small tsunami hit the town of Kamaichi in northern Japan. Kyodo news agency reported that contact had been lost with four trains in the coastal area.
Japanese politicians pushed for an emergency budget to fund relief efforts after Kan asked them to "save the country", Kyodo news agency reported. Japan is already the most heavily indebted major economy in the world, meaning any funding efforts would be closely scrutinised by financial markets.
Domestic media said the death toll was expected to exceed 1,000, most of whom appeared to have drowned by churning waters. Even in a nation accustomed to earthquakes, the devastation was shocking.

Japan has prided itself on its speedy tsunami warning system, which has been upgraded several times since its inception in 1952, including after a 7.8 magnitude quake triggered a 30-metre high wave before a warning was given.
The country has also built countless breakwaters and floodgates to protect ports and coastal areas, although experts said they might not have been enough to prevent disasters such as the one that struck on Friday.
"I was unable stay on my feet because of the violent shaking. The aftershocks gave us no reprieve. Then the tsunamis came when we tried to run for cover. It was the strongest quake I experienced," a woman with a baby on her back told television in northern Japan.
FIRES ACROSS THE COAST
The quake, the most powerful since Japan started keeping records 140 years ago, sparked at least 80 fires in cities and towns along the coast, Kyodo said.
Other Japanese nuclear power plants and oil refineries were shut down and one refinery was ablaze. Auto plants, electronics factories and refineries shut, roads buckled and power to millions of homes and businesses was knocked out. Several airports, including Tokyo's Narita, were closed and rail services halted. All ports were shut.

The tsunami alerts revived memories of the giant waves that struck Asia in 2004.
Warnings were issued for countries to the west of Japan and across the Pacific as far away as Colombia and Peru, but the tsunami dissipated as it sped across the ocean and worst fears in the Americas were not realised.

Earthquakes are common in Japan, one of the world's most seismically active areas.
[Writing by Dean Yates; Editing by John Chalmers]