Sources in the intelligence agencies said that Mohammad Yusuf Shah alias Syed Salahuddin, who also heads the alliance of pro-Pakistan terrorist groups called the United Jihad Council, was 'grievously injured in the attack and is undergoing treatment'. New Delhi, May 29 (IANS) Unable to carry out Pakistan's Inter-Services Intelligence (ISI) diktat of creating unrest in Jammu and Kashmir lately, terror outfit Hizbul Mujahideen chief Syed Salahuddin reportedly faced the ire of his masters when he was attacked by unknown assailants in Islamabad on May 25, sources said on Friday.