Sir:The assassination of the renowned Amjad Sabri in Karachi is an irreparable loss for the nation. His assassins escaped unharmed, and terrorists are once again challenging the security forces in the volatile megacity. Undoubtedly, Amjad Sabri was the one of the finest artists of the subcontinent. It shall perhaps take generations to come across another artist of such calibre. He was not only a master of spirituality and mysticism but was alsowas known for his mesmerising voice as a qawwal. Media reports suggested thatSabri had earlier submitted an application for his security but it was regrettable to know that his application was not taken seriously by relevant authorities. It’s high time that the government and concerned security institutions bring the perpetrators to justice and eliminate all elements that are causing instability in the city. IMRAN ALI PHULL Karachi