Giving a cold response to Prime Minister Manmohan Singh's [Images] statement favouring the conversion of Siachen glacier into a peace zone, Pakistan on Monday maintained its stand that India vacate its 'aggression' and withdraw troops to positions held at the time of 1972 Simla Agreement.

"India, as you know, committed aggression on Siachen in 1983. India has to vacate that aggression in order to make Siachen a peaceful area. We hope following the statement, India would unconditionally withdraw its aggression on the basis of past agreements," Foreign Office Spokesman Jalil Abbas Jilani told a media briefing.

He said the Siachen "aggression" is a violation of 1948 Karachi agreement as well as 1972 Simla agreement.

• First Look: PM visits Siachen

"We hope the statement reflects a change in the Indian position. Pakistan has always maintained that the Siachen issue should be resolved peacefully," he said.

While visiting the world's highest battlefield, Dr Singh said on Sunday that time has to make efforts to convert Siachen into a "peace mountain" but asserted there could be "no redrawing of boundaries" in the search for peace as it related to the country's security and prestige.

• Slide Show: PM on Siachen

Referring to a Joint Statement issued after the defence secretaries' talks in 1989 in which both sides "unconditionally" agreed to withdraw from Siachen "on the level the troops were deployed at the signing of Shimla agreement, he said "once that takes place Siachen would certainly become mountain of peace".