Pakistani and Indian border guards exchanged fire along the disputed border region of Kashmir, killing four people, including a teenage girl.
The Pakistani military said that the violence began late on January 2 when Indian forces violated a cease-fire agreement between the two countries with an unprovoked artillery attack near the city of Sialkot.
Indian officials blamed Pakistan for firing the first shots.
The shelling intensified in several locations on January 3, reportedly forcing the evacuation of hundreds of people living in the border areas of Indian-controlled Kashmir.
The latest violence comes after an Indian border guard and two Pakistan soldiers were killed by gunfire on December 31.
Nuclear-armed Pakistan and India have fought two wars over Muslim-majority Kashmir, which both countries claim as their own.