Two groups of suspected AIADMK workers clashed outside the party headquarters here, police said, on a day when the dominant faction led by Edappady K Palaniswami is set to elect him possibly as the single leader of the organisation in a crucial General Council meet.

On his part, former Coordinator O Panneerselvam (OPS) arrived at the party office, along with supporters, while EPS was on his way to a marriage hall in the city where the General Council meet is slated.