An unidentified person opened fire in a city bus 47-L bearing a number plate AP 28Z 4468 plying in between Secunderabad and Manikonda on Thursday. The firing incident has created panic among passengers. According to the reports, the miscreant has a verbal war with packed passengers and conductor during the boarding time, when he was asked to get down from the bus. Immediately, the miscreant opened fire and a bullet went through the rooftop of the bus. The panic-stricken passengers shocked to witness this. After the incident, he got down and ran away. It is learned that the person is a constable in a safari dress.