Workers inspect the structure inside the 8.5-kilometer (5.3-mile) Enasan Tunnel on the Chuo Expressway in Achimura, Nagano Prefecture, central Japan, Monday morning, Dec. 3, 2012. Concrete ceiling panels fell onto moving vehicles deep inside another tunnel on the same epressway Sunday, and authorities confirmed nine deaths before suspending rescue work Monday while the roof was being reinforced to prevent more collapses. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, FRANCE, HONG KONG, JAPAN AND SOUTH KOREA

Associated Press
Workers inspect the structure inside the 8.5-kilometer (5.3-mile) Enasan Tunnel on the Chuo Expressway in Achimura, Nagano Prefecture, central Japan, Monday morning, Dec. 3, 2012. Concrete ceiling panels fell onto moving vehicles deep inside another tunnel on the same epressway Sunday, and authorities confirmed nine deaths before suspending rescue work Monday while the roof was being reinforced to prevent more collapses. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, FRANCE, HONG KONG, JAPAN AND SOUTH KOREA
Workers inspect the structure inside the 8.5-kilometer (5.3-mile) Enasan Tunnel on the Chuo Expressway in Achimura, Nagano Prefecture, central Japan, Monday morning, Dec. 3, 2012. Concrete ceiling panels fell onto moving vehicles deep inside another tunnel on the same epressway Sunday, and authorities confirmed nine deaths before suspending rescue work Monday while the roof was being reinforced to prevent more collapses. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT, NO LICENSING IN CHINA, FRANCE, HONG KONG, JAPAN AND SOUTH KOREA
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