The Pakistan army violated the ceasefire agreement of 2003 and opened fire in Keran sector of Kupwara district in the early hours of Wednesday.
The intermittent firing continued on Wednesday evening and on Thursday too, beginning around 8 am and carrying on till late evening, injuring a jawan.
In the retaliatory firing from the Indian side, three Pakistani soldiers died.
Reports from Pakistan quoting military spokesman Major-General Athar Abbas said: "Our soldiers were moving from one post to another when they came under fire. Three soldiers were killed."
A defence spokesperson said the army was forced to retaliate after it came under heavy fire from the Pakistan army, which was a violation of ceasefire agreement signed by the two countries in 2003.
"The Pakistan forces fired from Saheli post along the Line of Control (LoC) last night, which continued for about an hour," defence spokesperson of northern command Lt Col JS Brar told HT.
In the early hours of Wednesday, an infiltration attempt was made in the area and a Naib Subedar died while foiling it. At the same time, the army came under heavy fire from across the LoC.
"The Pakistan army was providing covering fire to the infiltrators," said an army officer on condition of anonymity.
{{/usCountry}}"The Pakistan army was providing covering fire to the infiltrators," said an army officer on condition of anonymity.
{{/usCountry}}There has been a rise in infiltration attempts lately, especially in the Kupwara sector.
On July 30, three army personnel died in Furqiangali during an encounter with heavily armed infiltrators. In August, four infiltration attempts were foiled and five terrorists died in counter-insurgency operation.