why PML-N workers attacked NAB office with planing and repeated history

Pakistan Muslim League Nawaz workers gathered at NAB office Lahore during the hearing of Maryam Nawaz's case.Govt.officials said PML-N workers were trained for this day to make this incident deliberately in the leadership of Maryam Nawaz to escape from the hearing.NAB building damaged with stones thrown by workers on the orders of Maryam Nawaz and Rana Sana Ullah. Punjab police arrested more than 58 people.dr Shahbaz gill said that Nawaz sharif medical conditions were deteriorated deliberately by the personal consultant of Nawaz sharif dr Adnan to get bail for him.