Kanpur, Mar 2 (ANI): While blowing the poll bugle in Uttar Pradesh’s Kanpur city, AAP leader Arvind Kejriwal on Sunday launched a scathing attack against all the political parties including the state ruling Samajwadi Party. Kejriwal invoked last year's Muzaffarnagar communal riots that left many people dead and missing. He said that political parties provoke riots for vested interest.