"A soldier shot at two of his colleagues in Poonch sector at 1315 hours today," a defence spokesman said adding that both of them died.
The accused soldier then committed suicide by shooting himself, he said.
Sepoy Darshan Lal entered into a verbal duel with his senior Havaldar Ranjot Singh and in a fit of rage fired at him, according to official sources.
The incident occurred at a forward post Madan in Digwar belt along LoC in Poonch district.
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After the shooting, the soldier turned the gun on himself, they said.
Senior officers rushed to the spot after the incident of fratricide.
The Army has ordered court of inquiry (CoI) into the incident, the spokesman said.