Fifty students complained of feeling unwell, with all taken to the hospital, after a gas smell was reported Monday at an elementary school in Osaka Prefecture, local authorities said.
All are conscious and none are considered to be in a serious condition, according to police, who received a report from firefighters around 10:05 a.m. that a gas odor had been detected at Kamei Elementary School in the city of Yao.
No gas leak from the building of the city-run school has been confirmed, officials of the Yao police station said, adding that no suspicious object has been found at the school. The local police are investigating details of the incident, but they have not determined the cause of the smell, they said.