Border action teams (BATs) crossed into the Indian side as Pakistan army launched heavy rocket and mortar firing on two forward posts in the Krishna Ghati sector in Poonch.
The simultaneous, unprovoked attacks took place this morning, in which an army JCO and a BSF head constable were killed and another soldier was injured, a defence spokesman said.
The Indian Army said that such "despicable" acts of Pakistan's army would be "appropriately responded" to.
Pakistan's Army carried out unprovoked rocket and mortar firing on two forward posts on the Line of Control in Krishna Ghati Sector (in Poonch district) this morning, a spokesman of the Indian Army's Northern Command said in statement here.
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Simultaneously, a BAT operation was launched on a patrol operating between the two posts, it said.
"In a unsoldierly act by the Pak Army the bodies of two of our soldiers in the patrol were mutilated," the spokesman said.
The deceased have been identified as Head Constable Prem Sagar of 200th Battalion of the BSF and Naib Subedar Paramjeet Singh of 22 Sikh Regiment of the army.
Constable Rajinder Singh of the BSF battalion suffered injuries in the attack.
A BSF officer said troops guarding the border line retaliated effectively, he said.
In April this year, there have been seven ceasefire violations by Pakistan along the LoC in Poonch and Rajouri sectors of Jammu and Kashmir.
On April 19, Pakistani troops violated the ceasefire along the LoC in Poonch sector.
They had broken the ceasefire in the same sector on April 8, in Poonch district on April 5, in Bhimbher Gali (BG) sector on April 4 and twice on April 3 in Balakote and (Digwar) Poonch sectors.
In Digwar sector of Poonch, a Junior Commissioned Officer (JCO), Naib Subedar S Sanayaima Som, was killed in an improvise explosive device (IED) blast along the LoC in Poonch sector on April 1.
There were four violations of the ceasefire along the LoC in Poonch in March.