More than 20 people have been taken to hospital after someone sprayed an unknown substance in Tokyo, authorities said.
The Tokyo fire department said 26 people suddenly developed sore throats and felt unwell near the city's luxury Ginza Six shopping complex. All but one of them were taken to hospital.
Their symptoms were believed to be mild, according to officials.
Authorities did not clarify what substance was sprayed, but Japanese newspaper Yomiuri reported that police found traces of pepper spray.
Yuzo Tsuda, a 78-year-old Tokyo resident, said he walked toward the shopping complex, drawn by the commotion, when he suddenly felt pain in his throat and started coughing.
He told the Associated Press the ache in his throat subsided about an hour later, adding that he didn't plan to go to the hospital.
Firefighters and officials wearing hazmat suits and face masks were seen helping people at the scene, with some being taken out of the shopping centre.
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Dozens of fire engines and ambulances were parked outside the building and roads in the area were temporarily closed.
Authorities said an investigation is underway.
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