The incident happened at Hisawada, the native village of Bihar Governor Satya Pal Malik, who was visiting it for the first time after assuming office.
The venue was decorated with gas balloons and the incident occurred when some children started taking away the balloons, District Magistrate (DM) of Baghpat Bhawani Singh said.
The children got injured after the balloons caught fire, he said.
The injured were sent to the district hospital. Later in the evening, three were discharged, while one child was referred to Delhi for treatment, the DM added.
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