The two senior police officers who were sentenced to 17 years in prison for negligence and security lapses that led to the assassination of ex-PM Benazir Bhutto in 2007 have challenged the verdict at the lahore HC on Thursday. An Anti-Terrorism Court in Rawalpindi last week convicted Additional Inspector General Saud Aziz and SSP Khurram Shehzad, and fined them Rs1 mn each besides sentencing them to 17 years in jail.