Three soldiers of the Indian Army were killed and the body of one mutilated in Macchal, Jammu and Kashmir, the army said on Tuesday.
"Retribution will be heavy for this cowardly act," the army said in a statement. "The incident will be responded to appropriately," it added.
This is the second incident in a month of a soldier being mutilated.
The intruders are believed to have escaped.
Terrorists mutilated the body of 27-year-old Sepoy Mandeep Singh before running back into Pakistan-Controlled Kashmir, under cover fire provided by Pakistan army.