A property dealer was stabbed several times and critically injured by a constable here on Saturday following a heated argument over car parking, Delhi Police said.
Police said the accused constable has been arrested.
Victim Gajendra Pawar of Shahpur Jat in south Delhi has been admitted to the All India Institute of Medical Sciences (AIIMS) trauma centre.
Pawar's elder brother is posted as Sub - Inspector in the Delhi Police.
According to police, accused Suraj Bhan is a resident of Shahpur Jat area.
Suraj stabbed Pawar in his left eye and chest after the arguments, leaving Pawar in a pool of blood, police said.
He later fled the spot.