DERA ISMAIL KHAN / ISLAMABAD: In a public appearance days after his arrest warrants were issued by a court in Rawalpindi, Khyber Pakhtunkhwa Chief Minister Ali Amin Gandapur accused the federal government of “using” the army to open fire at PTI supporters. While talking to media persons after attending the convocation of Gomal Medical College in his hometown, D.I. Khan, …