Nearly 15 persons were injured, including five police personnel, after workers of the ruling BRS and the Congress clashed at Ibrahimpatnam on Thursday, police said. The incident took place when Congress candidate Malreddy Ranga Reddy and BRS candidate Manchireddy Kishan Reddy were arriving in procession to file their nominations at the office of the returning officer. When party workers from both sides were crossing the road, they raised slogans and suddenly started pelting stones at each other.