There was no immediate report of casualty or injury on the Indian side.
Indian troops opened fire on the suspected infiltrators, the spokesman said adding that thereafter exchange of heavy fire took place.
After about half-an-hour of exchange of fire, the suspected infiltrators disappered from the scene, Col Palta said adding the intensity of firing from both sides has reduced but is going on.
It is suspected that either a groups of militants or Border Action Team (BAT) could have been undertaking movement close to LoC opposite Krishnagati sub-sector in Poonch on Saturday night.
The eruption of exchange of fire broke a lull of 48 hours.
Pakistani troops had violated the ceasefire by firing mortars shells and from small arms on Indian posts along LoC in Krishnagati sector of Poonch district on Thursday, the defence spokesman said.
Thursday's was the third ceasefire violation by Pakistan troops along Poonch sector after the barbaric killing of two Indian jawans.