India has lodged a formal complaint with Pakistan over the alleged killing of two Indian soldiers by Pakistani troops in disputed Kashmir and called on Islamabad to immediately investigate the incident.

Indian officials summoned the Pakistani high commissioner (Salman Bashir) in New Delhi on Wednesday about that clash they said violated “all norms of international conduct.” Pakistan has denied carrying out an unprovoked attack.

India's military says its soldiers were on patrol Tuesday near the town of Mendhar when Pakistani troops crossed into Indian-controlled Kashmir and shot dead two Indian soldiers in a firefight. An Indian military official says a body of one of the soldiers was later found “badly mutilated” in Kashmir. Indian Defense Minister A.K. Antony has called the treatment of the body “inhuman.”

Pakistan's military said the Indian allegations are “propaganda to divert attention of the world from Sunday's raid on a Pakistani post by Indian troops, in which a Pakistani soldier was killed.”

The clash sparked a protest Wednesday in the central Indian city of Bhopal, where residents joined members of the youth wing of the ruling Congress party to denounce Pakistan and burn an effigy bearing the Pakistani flag.

On Sunday, Pakistan said Indian troops crossed the disputed border known as the “Line of Control” and raided a Pakistani military outpost. They said Indian forces withdrew after an exchange of gunfire.

Pakistan protested the Indian attack.

Indian officials dismissed the Pakistani claims as baseless, saying their troops returned fire from across the border.

India and Pakistan have accused each other of several violations of a 2003 ceasefire in Kashmir, a region they both claim.

The nuclear-armed neighbors have fought two wars over Kashmir since gaining independence from Britain in 1947.