The incident has been reported from Jagdishpur area of Amethi. Initial reports suggest old rivalry is the reason behind these clashes.
The violent mob set two buses on fire and damaged many shops and other properties in Kasganj area.
Workers of both parties clashed reportedly after BJP supporters protested with banners and placards against the Congress president.
The protesters blocked roads in several areas of Mumbai, forced shops to shut down and also attacked a journalist of a television news channel.