Around 20 people were injured at a luxury shopping complex in the Japanese capital of Tokyo on Monday after a man sprayed a substance inside, police and fire department officials said.

Tokyo police spokesman Yusuke Koide said that a man sprayed a substance at an ATM on the ground floor of the building, while a local fire department official said “around 20 people were injured” after a report of a “smell”.

The road in front of the mall – located in the touristy and upmarket shopping district of Ginza – was blocked off following the incident, and fire trucks lined the street.

But shoppers continued to come and go from the building using side entrances.

A reporter at the scene saw two people on stretchers being put into an ambulance, while firefighters and officials dressed in hazmat suits brought people from the mall into specialised trucks to examine them.

Public broadcaster NHK said the injuries appeared to be light.