Muttahida Qaumi Movement (MQM) leader Altaf Hussain expressing his deep condolence over the killing of MQM leader Imran Farooq said that this is the saddest incident of his life and dubbed Imran Farooq as Shaheed-e-Inqilab. Dr Imran Farooq was climbing the stairs of his flat in Mill Hill, North London, when an unknown person stabbed him twice. He fell down the stairs. The assailant followed him and again stabbed him twice at the bottom of the stairs. He was shifted to a nearby hospital where he was pronounced dead. Altaf Hussain addressing the media from the MQM's international secretariat in London said that he was deeply saddened by the sudden death of Dr. Imran in the most unprecedented manner. He added that Dr Imran Farooq is remembered by Muttahida loyalists as one of the key figures who laid the foundation for MQM. He wished that the murderers of Dr. Imran should be brought to justice as soon as possible. He said that he would never forget this grief and he has lost one of his great comrades Meanwhile Following the confirmation of his death, all birthday celebrations of the MQM chief were cancelled and the MQM has announced 10 day mourning. In a late night press conference at the residence of Dr Imran Farooq, his close associate Dr Farooq Sattar said the death of Dr Farooq was a great loss for the party and the MQM activists. He announced 10-day mourning on behalf of the MQM Rabita Committee. During the mourning period, MQM activities throughout the world will remain suspended. The Rabita Committee, he said, also condoled with the bereaved family. He said that the MQM chief was greatly upset over the death of Dr Imran Farooq. The place of burial of Dr Imran Farooq will be decided later. He hoped that the unidentified killer would be soon arrested.