Eight students, including six girls, were admitted to Mancholai Hospital, Mullaitivu, following a minor explosion at Sinhala Maha Vidyalaya in Kokilai.
Police found that the ignition of a gelegnite gel stick used in fishing had caused the explosion.
The Police media division said, the explosion occurred near the perimeter fence of the school around 9 am, when they set fire to garbage collected during an anti dengue cleaning programme, yesterday.
Students who received a minor shock were admitted to the Mancholai Hospital.