The incident occurred yesterday around 10.25 PM, officials said.
When Vishram, who is posted at the Kalkaji police station, was waiting for a bus at the Pushp Vihar bus stand, three men came on a motorcycle and stopped in front of him, police said.
They tried to rob his cell phone but when he resisted, one of the accused attacked him with a knife, they added.
However, they could not succeed in snatching his mobile phone, even as a wounded Vishram was rushed to AIIMS Trauma Centre where he was discharged after first-aid.
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