The exchange, which started at 5.15 am, continued for more than an hour till 6.45 in the morning.
A woman was killed when Indian and Pakistani troops exchanged firing and shelling in Mendhar sector of the Poonch district early Saturday.
Tomar, 42 years, belonged to village Tarsana in Madhya Pradesh's Morena district and is survived by his wife and a son and daughter.
According to a defence ministry spokesperson Lt Colonel Manish Mehta, "The Pakistani army initiated unprovoked and indiscriminate firing of small arms, automatic weapons and mortars from 5".
"He was a fearless and honest soldier".
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Indian Army personnel guarding the border posts retaliated strongly and effectively. "The nation will always remain indebted to him for the supreme sacrifice and devotion to duty", said Mehta.
"One jawan was martyred, and another one was critically injured during ceasefire violations by Pakistani troops", a senior Army official said.
"A mortar shell landed in a residential house of Mohammad Shabir at Gohlad, Kalran area of Balakote sector".
"The 45-year-old woman Raqia Begum was a resident of upper Golat in Mendhar", said Mendhar Sub-Divisional Police Officer (SDPO) Riyaz Tantray. On August 8, Sepoy Pawan Singh Sugra (21) was killed in unprovoked Pakistani firing.
India and Pakistan routinely accuse each other's forces of violating a 2003 ceasefire accord.