At least 13 people were killed after a powerful earthquake struck Japan’s southwestern Kyushu island on Tuesday, with many others believed trapped beneath rubble. More than 100 aftershocks were recorded through Wednesday. The Japan Meteorological Agency measured the quake at magnitude 7.1, while the US Geological Survey put it at 6.8. Its epicentre was 20 kilometres south of Kumamoto city at a depth of 10 kilometres.

Prime Minister Sanae Takaichi said more than 20 hours after the earthquake, people were still waiting for help and rescuing those trapped was a race against time. More than 4,600 personnel, including military members, have been deployed. At the Aeon Mall in the Kashima area, an explosion about an hour after the quake caused part of the second floor to collapse, killing three people and leaving three workers missing.

Two people were found unconscious at a paper factory in Yatsushiro, where nine more workers were missing. Thousands of homes lost power and thousands of people moved to shelters. With temperatures at 35 degrees Celsius, 300 air-conditioning units were being sent to affected centres in Kumamoto. Authorities warned of stronger aftershocks over the coming week, especially within two to three days.