This is for the first time that artillery has been used to target forward posts and villages along the LoC.
The shelling on Tal Rifaat, controlled by local Kurdish fighters, took place as students were leaving the building and wounded 21 others.
The mortar shelling from across the border started in Balakote area of Mendhar sector.
An official said the population in Tangdhar sector has been asked to stay indoors and rush to underground bunkers in case of Pakistani troops firing and mortar shelling.
Violent clashes have taken place primarily around the Syrian border towns of Tal Abyad and Ras al-Ayn, which are controlled by the YPG.
Two jawans were also injured in the Pakistani shelling in Akhnoor sector of Jammu district, officials said.
The victim, Rahmi Bhat, from Bagtore area near the Line of Control (LoC) in Gurez sector was hit by a mortar splinter late on Tuesday.
Heavy firing was going on in all the three sectors and there are reports of some damage to civilian houses as well.
The officials said that the situation was very tense as the firing and shelling by Pakistan has been going on intermittently from across the border.
BSF troops guarding the border retaliated and the heavy exchange of fire between the two sides was going on when last reports came in.
Jammu and Kashmir Government talks of Vajpayee doctrine after killing of four soldiers in Pakistan firing
Minister Abdul Rehman Veeri called for the resumption of the peace process between New Delhi and Islamabad to restore everlasting peace in the region.
The Pakistani Army has been supporting infiltration by terrorists along the border, Army Vice Chief Sarath Chand said.
Officials said that the situation was very tense as firing and shelling by Pakistani troops continued round the clock.
Pakistani forces opened unprovoked and heavy firing and shelling along LoC in Bhimbher Gali sector of Rajouri district this evening.