A crime scene has been established while SafeWork NSW has been notified of the incident.
An 11-year-old boy was taken to Royal North Shore Hospital after being hit in the chest by a firework.
He sustained burns and a chest injury and was later transferred to Westmead’s Children Hospital.
Meanwhile, an eight-year-old girl was also taken to Northern Beaches Hospital with a wrist injury after being caught up in the terrified, fleeing crowd.
Police said emergency services were called to the oval and were told a firework had shot into a crowd of people during an event.
Both children’s injuries were non-life threatening.
A number of other patrons were also treated at the scene.
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