Five of the injured were in critical condition, said OP Kalra, medical superintendent of the Guru Tegh Bahadur Hospital, where the injured boys and girls, were taken.
The stampede occurred early in the school day as students arrived for an exam, Kalra told reporters. The Press Trust of India news agency said the stampede was set off by rumors about an electrical short-circuit in the government-run school.
The students were from 8 to 16 years of age, police spokesman Rajan Bhagat said.
Parents gathered outside the school after the incident, wailing in anguish. A few threw rocks at the building, news reports said.
Angry residents also hurled rocks at a bus and fire engine, injuring one person, before police reinforcements arrived on the scene, eyewitnesses said.
A government investigation has been ordered into the stampede, said Sheila Dikshit, New Delhi´s top official.
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