Karachi [Pakistan], February 3 (ANI): A 12-year-old boy was killed while three others were injured in a clash between the Muttahida Qaumi Movement-Pakistan (MQM-P) and the Pakistan People’s Party (PPP) in Karachi, ARY News reported citing police sources. According to the police, the clash between the MQM-P and PPP workers in New Karachi Sector 11-J left a 12-year-old boy dead while three others sustained injuries in the firing incident. The police said activists of both parties came face-to-face during election campaigning in the area. The supporters of both sides initially exchanged heated wo…