District officials said the incident occurred at Kachua under Raha assembly constituency.
AIUDF President and Lok Sabha MP Maulana Badruddin Ajmal had come to address a rally at Kachua this morning, which was part of AIUDF's mass programme in the run-up to the panchayat polls in Assam.
After Ajmal left the venue, a bike rally taken out by supporters of Congress reached the spot.
Soon a scuffle started between the bike rallyist and the AIUDF workers and during the ensuing clash six persons were injured.