An explosion at a building in Tokyo’s commercial district of Shimbashi on Monday shattered windows and spewed smoke, according to media reports.

Police were investigating the site after receiving an emergency call, Kyodo news reported.

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explosion site in Tokyo

Firefighters work outside of a building where an explosion occurred in the Shimbashi area of Tokyo on July 3, 2023.  (KAZUHIRO NOGI/AFP via Getty Images)

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NHK television, quoting fire department officials, said four people were injured.

No other information, including the cause, was yet available.