President Asif Ali Zardari has expressed grave concern over the threats by a pastor in Miami to burn copies of Holy Quran on Sept 11.Spokesperson Farhatullah Babar said that the President taking note of the distressing reports said anyone who even thought of such a despicable act must be suffering from a diseased mind and a sickly soul.He said it will inflame sentiments among Muslims throughout the world and cause irreparable damage to interfaith harmony and also to world peace.The President called for doing all that it takes to stop such a senseless and outrageous act.