MASHIKI, JAPAN -- Two powerful earthquakes a day apart shook southwestern Japan, killing at least 16 people, trapping many others beneath flattened homes and sending thousands of residents to seek refuge in gymnasiums and hotel lobbies.
The exact number of casualties remained unclear as rescue efforts continued to unfold Saturday. Police said at least six were killed in a magnitude 7.3 quake that shook the Kumamoto region on the southwestern island of Kyushu at 1:25 a.m Saturday. On Thursday night, Kyushu was hit by a magnitude-6.5 quake that left 10 dead and more than 800 injured.
The fire department reported at least seven dead from the early Saturday quake, according to Kumamoto Prefectural official Tomoyuki Tanaka.
A series of aftershocks ensued, including a magnitude-5.4 Saturday morning. The Japan Meteorological Agency said that the quake that struck earlier Saturday may be the main quake, with tge earlier one a precursor. The quakes' epicenters have been relatively shallow - about 10 kilometers (6 miles) - and close to the surface, resulting in more severe shaking and damage.
Japanese media reported that nearly 200,000 homes were without electricity. Drinking water systems had also failed in the area.
Hundreds of people were reported injured, although some of the injuries were minor.
Chief Cabinet Secretary Yoshihide Suga, in an emergency news conference early Saturday, said more than 300 calls came in to the Kumamoto police and another 100 to police in nearby Oita, seeking help and reporting people trapped or buried underneath debris. He said 1,600 soldiers joined rescue efforts. Prime Minister Shinzo Abe said damage from the magnitude-7.3 quake could be extensive.
The Nuclear Regulation Authority reported no abnormalities at Kyushu's Sendai nuclear plant.
Public broadcaster NHK TV showed stones tumbled from the walls of historic Kumamoto Castle, and a wooden structure in the complex was smashed. At the Ark Hotel, east of the castle, hotel guests woke up to strong shaking and a warning siren. Hotel staff told guests, including tourists and journalists covering the quake, to evacuate their rooms and gather in the lobby for safety.
A bright spot, broadcast repeatedly on television Friday, was the overnight rescue of an apparently uninjured baby, wrapped in a blanket and carried out of the rubble of a home.
Saturday's quake hit residents who were still in shock from the previous night's earthquake and had suffered through more than 100 aftershocks.
Yuichiro Yoshikado said Thursday's quake stuck as he was taking a bath in his apartment in Mashiki.
"I grabbed onto the sides of the bathtub, but the water in the tub, it was about 70 percent filled with water, was going like this," he said, waving his arms, "and all the water splashed out."
"It's as if all control was lost. I thought I was going to die and I couldn't bear it any longer."
Yoshikado, whose building was undamaged despite the intense shaking, checked the damage at his aunt and uncle's home nearby. Kitchenware was scattered on the floor, and a clock had stopped around 9:26 p.m., the time of Thursday's quake.
The latest victim of Thursday's quake was killed in a fire in the city of Yatsushiro, the Kumamoto prefecture said, adding that two other people were in a state of heart and lung failure. The nine other dead included five women and four men, the Fire and Disaster Management Agency said.
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