Kumamoto earthquake: Mall explosion traps people, tsunami warning issued
Synopsis
Hours after a magnitude 7.1 earthquake — one of Japan's strongest in years — rocked Kumamoto Prefecture, an explosion tore through Aeon Mall Kumamoto, collapsing part of the second floor and trapping multiple people inside. With a tsunami warning simultaneously active for the Ariake and Yatsushiro seas, the region faces a compounding disaster that is still unfolding.
Key Takeaways
An explosion struck Aeon Mall Kumamoto in Kashima Town at around 6:00 pm local time on 28 July , leaving multiple people trapped and injured.
Part of the mall's second floor collapsed ; aerial footage showed severe exterior and roof damage.
The explosion followed a magnitude 7.1 earthquake that hit Kumamoto Prefecture at 4:27 pm at a depth of 10 km .
The Japan Meteorological Agency recorded a maximum seismic intensity of 7 in the hardest-hit areas.
A tsunami warning of one metre has been issued for the Ariake Sea and Yatsushiro Sea .
The cause of the explosion remains under investigation; a gas leak triggered by earthquake damage is among likely scenarios.
An explosion tore through Aeon Mall Kumamoto in Kashima Town, Kumamoto Prefecture, southwestern Japan, on Tuesday evening, leaving multiple people trapped and injured after a powerful magnitude 7.1 earthquake struck the region earlier in the day. Public broadcaster NHK reported the blast, which sent emergency calls flooding into police and fire authorities at around 6:00 pm local time.
What Happened at the Mall
According to Japan's Fire and Disaster Management Agency, information relayed from the local fire department indicated that part of Aeon Mall Kumamoto's second floor had collapsed, with numerous people believed to be trapped inside. Police and fire authorities said callers reported an explosion-like sound and white smoke rising from the building.
Aerial footage captured by an NHK helicopter at around 6:20 pm showed severe structural damage — sections of the exterior wall had peeled away, exposing the steel framework beneath, while part of the roof appeared to have caved in. A large hole was also visible on the rooftop.
Rescue Operations Under Way
Firefighters were working to verify the extent of the situation and conduct rescue operations, according to reports. Injured individuals had been transported to hospitals, though authorities had not yet disclosed the number of casualties or the severity of injuries at the time of reporting. The cause of the explosion remains under investigation.
The Earthquake That Preceded It
The explosion came hours after a magnitude 7.1 earthquake struck Kumamoto Prefecture at approximately 4:27 pm local time, at a depth of about 10 km. The Japan Meteorological Agency recorded a maximum seismic intensity of 7 — the highest on Japan's scale — in the hardest-hit areas of the prefecture. Kashima Town is believed to have experienced shaking of at least lower 5 on the same scale, though the exact intensity had yet to be officially confirmed.
Notably, Kumamoto has a history of devastating seismic events — the prefecture was struck by a series of powerful quakes in April 2016, including two magnitude 6.5 and 7.0 tremors that killed over 50 people and displaced tens of thousands.
Tsunami Warning Issued
A tsunami warning of one metre has been issued for the Ariake Sea and Yatsushiro Sea in southwestern Japan following the earthquake. Residents in coastal areas have been urged to take precautions. The dual threat — seismic damage and a potential tsunami — compounds the emergency response challenge for local authorities.
What Comes Next
Rescue teams are continuing operations at the mall site as investigators work to determine whether the explosion was triggered by a gas leak or other infrastructure failure caused by the earthquake. The full scale of casualties and structural damage across Kumamoto Prefecture is expected to become clearer in the coming hours.
Point of View
Structural explosion, and tsunami threat arriving in rapid succession — and it exposes the limits of even Japan's world-class emergency response infrastructure when multiple crises converge simultaneously. The fact that the explosion occurred inside a major commercial mall during evening hours, when foot traffic would have been high, raises serious questions about gas-line resilience standards in earthquake-prone commercial structures. Kumamoto was already a cautionary tale after 2016; the recurrence of catastrophic seismic damage in the same prefecture will intensify debate about whether Japan's building retrofit programmes have kept pace with updated seismic risk models. The tsunami warning layered on top means coastal evacuation and inland rescue operations must run in parallel — a resource strain that will be closely scrutinised in post-event reviews.
NationPress
28 Jul 2026
Frequently Asked Questions
What happened at Aeon Mall Kumamoto on 28 July?
An explosion struck Aeon Mall Kumamoto in Kashima Town, Kumamoto Prefecture, at around 6:00 pm local time on 28 July, causing part of the second floor to collapse and leaving multiple people trapped and injured. The cause of the explosion is under investigation, and it occurred hours after a magnitude 7.1 earthquake hit the region.
How powerful was the Kumamoto earthquake on 28 July?
The earthquake measured magnitude 7.1 and struck at approximately 4:27 pm local time at a depth of about 10 km. The Japan Meteorological Agency recorded a maximum seismic intensity of 7 — the highest on Japan's scale — in the hardest-hit areas of Kumamoto Prefecture.
Has a tsunami warning been issued after the Kumamoto earthquake?
Yes. A tsunami warning of one metre has been issued for the Ariake Sea and Yatsushiro Sea in southwestern Japan following the magnitude 7.1 earthquake. Coastal residents in the affected areas have been urged to take precautions.
What is the condition of those trapped in the mall?
As of the latest reports, injured individuals had been transported to hospitals, but authorities had not yet disclosed the exact number of casualties or the severity of injuries. Rescue operations were ongoing at the time of reporting.
Is this the first major earthquake to hit Kumamoto?
No. Kumamoto was struck by a devastating sequence of earthquakes in April 2016, including tremors of magnitude 6.5 and 7.0, which killed more than 50 people and displaced tens of thousands. Tuesday's magnitude 7.1 event is one of the most powerful to hit the prefecture since that disaster.
