The students were taken to Haldibari hospital, which then referred about 15 of them to Jalpaiguri hospital, they said.
The children complained of breathlessness and pain in the ears, Chief Medical of Jalpaiguri hospital Jagannath Sarkar said, adding, splinters from the bomb also hit a few of them.
Some of the students at Haldibari hospital were released after they were administered first aid, hospital sources said.
An examination was underway in the school when the bomb was being defused.
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