Prime Minister (PM) Shehbaz Sharif on Thursday said the federal government will investigate the issue of ‘suspicious letters’ received by judges. According to sources, four SC judges including CJP Justice Qazi Faez Isa, eight judges of Islamabad High Court and four judges of Lahore High Court have received ‘threatening letters with suspicious powder’. Chairing a federal cabinet meeting in Islamabad today, he said this matter will be taken up with a sense of responsibility. He emphasized there should be no politics on this matter.