Firemen work at the accident site after a blast happened in the kitchen of a restaurant in the Xinluo District of Longyan City, southeast China's Fujian Province, Dec. 16, 2015. Seven people were killed in the explosion, which occurred Wednesday evening. Three others are receiving emergency treatment in a hospital. (Xinhua/Zhou Yangdong)

Rescuers transfer an injured man after a blast happened in the kitchen of a restaurant in the Xinluo District of Longyan City, southeast China's Fujian Province, Dec. 16, 2015. Seven people were killed in the explosion, which occurred Wednesday evening. Three others are receiving emergency treatment in a hospital. (Xinhua/Zhou Yangdong)

Firemen work at the accident site after a blast happened in the kitchen of a restaurant in the Xinluo District of Longyan City, southeast China's Fujian Province, Dec. 16, 2015. Seven people were killed in the explosion, which occurred Wednesday evening. Three others are receiving emergency treatment in a hospital. (Xinhua/Zhou Yangdong)