<span>TOKYO -- </span>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.

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

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

An explosion at a building in Tokyo’s commercial district of Shimbashi has shattered windows and spewed smoke, according to media reports{ai:summary}<p>An explosion rocks Tokyo's commercial district, Shimbashi, shattering windows and causing smoke. Police investigate the site after an emergency call, while four people are reported injured. The cause remains unknown. #society</p>

An explosion in a downtown Tokyo building has injured four people, according to media reports

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