RAWALPINDI- Two persons were killed and several others injured in an incident of indiscriminate firing between two groups outside Rawalpindi district court today. According to police personnel, the firing led to the killing of a prisoner and a passerby. Moreover, an exchange of fire between police and armed attackers also took place after which policemen arrested four assailants. After the incident, people panicked and rushed outside the court. Police and security forces cordoned off the area. Sources said that Advocate Sardar Amir was the target of unknown attackers, adding that the incident seemed to be the result of a personal rivalry. The dead bodies and injured in the attack were shifted to hospital. Security has been beefed up in Rawalpindi and Islamabad following Wednesday's deadly blast in Sabzi Mandi which left 25 people dead.