Six children were taken to hospital in the city of Sheffield, the BBC reported Friday. According to the broadcaster, police were called after "reports of concerns for safety" at around 7:30, with an air ambulance landing in the playground near Hartley Brook Primary Academy.
Two people have reportedly been arrested, although authorities have provided no further details on the incident.
South Yorkshire Police have announced that the incident is over, although officers are still at the scene and diverting vehicles from the cordoned area.