Vaiko said it was not acceptable that weapons provided for policemen's protection were used for "firing at innocent" persons.
"To maintain the credibility of the police force, a case of attempt to murder must be filed against Inspector Pusparaj and he should be punished," Vaiko said in a statement while demanding that the state government provide the best medical treatment for the injured boy, besides compensation for his family.
An FIR under IPC Section 338 (causing grievous hurt by act endangering life or personal safety of others) has been filed against him.
The boy is undergoing treatment at a private hospital.