(Trigger warning: Description of violence.)
The accused student fired three rounds from a countrymade pistol, and fled away.
The injured principal, Ram Singh Verma, has been sent to KGMU Lucknow, and he is currently out of danger now, the police said.
"Yesterday (23 September), the accused student had a fight with another student who later complained about the same to the principal," said Narendra Pratap Singh, Additional Superintendent of Police, Sitapur.
He further added that the principal called both the students, scolded them and beat them up. "The accused student was upset because of this, which led him to get a countrymade pistol to school the next day, and fire at the principal of the school," Singh said.
The incident took place at the Adarsh Ram Swaroop, Sitapur around 7 am on Saturday.
As per the CCTV footage of the incident, the accused is seen chasing the principal while pointing a gun at him. It also shows that some other people tried to stop him.
A family member of the principal also claimed that the accused threatened that he will shoot the principal because he had beaten him.
The police said that a case has been registered and search of the accused is underway.