"Parminder Singh, a police commando, sustained injury after a bullet went off accidentally when his service pistol was being cleaned," Station House Officer (SHO) Neeraj Sarna said.
He said the bullet hit the ground and the cop was hit in the foot by a pellet.
All the commandos deposit their weapons outside the Chief Minister's residence where these are checked, Sarna said, adding the bullet could have been left behind in the pistol inadvertently.
The injured cop was later taken to a hospital.
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