Miscreants stoned a van in which cadres of Pattali Makkal Katchi (PKM) were proceeding from Avaniapuram to Vadipatti, the venue of the party conference held on Sunday. Police said that as the vehicle was approaching Fatima College junction around 5 p.m., some youths pelted stones and on it and escaped. A seven-year-old boy travelling on the van was injured. While the PMK cadres suspected the offenders to be members of a rival party and even named a few of them, the police maintained that they had not received complaint.