Japan's Self Defence Forces joined rescue workers in the search and rescue operations at a badly damaged shopping mall and helped deliver water and transfer the patients, after a magnitude 7.1 earthquake struck the Kumamoto area on the southern main island of Kyushu late Tuesday afternoon. The quake collapsed the second floor of the Aeon Mall in Kashima Town, trapping people, according to the fire department in the prefectural capital of Kumamoto. Prefectural officials said they are investigating an explosion reportedly from a gas leak. Japanese Prime Minister Sanae Takaichi said 13 people have been found dead so far and rescue work was continuing Wednesday morning for the missing. A magnitude 7.1 earthquake struck the Kumamoto area on the southern main island of Kyushu late Tuesday afternoon.