At least 84 people have been exposed to suspected irritant gas at a secondary school in southwestern Germany, according to the German news agency dpa.
Both students and teachers experienced mostly mild health effects at the school in the city of Singen, dpa said. Three students and a teacher, however, had to be taken to hospital after suffering serious breathing problems.
The school was evacuated and police cordoned off the area on Wednesday. It was not immediately known if the incident involved a leak or spill.
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During the fourth lesson, several students suddenly complained of breathing problems and teachers began evacuating the building and making emergency calls. Students without symptoms were taken to a nearby church, where their parents picked them up, dpa reported.
Irritant gases include ammonia, chlorine, hydrogen chloride, and sulfur dioxide. Inhaling its vapors can cause respiratory problems.
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