Damage is seen to part of a Japanese shopping mall after a strong earthquake. YUICHI YAMAZAKI via Getty ImagesKUMAMOTO, Japan (AP) — Japanese Prime Minister Sanae Takaichi said 13 people have been found dead after a powerful quake shook part of southwestern Japan 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. AdvertisementEmergency vehicles are seen outside the Aeon Mall Kumamoto in Kashima town, Kumamoto Prefecture, on July 29. AdvertisementShinji Kiyomoto with the Japan Meteorological Agency urged residents to be cautious over the next two to three days due to potential aftershocks.