A procession of BJP activists on certain local issues resulted in the clash with CPI-M workers, police said.
The clash occurred after stones were allegedly pelted at the processionists, they said, adding most of the injured were BJP workers.
The 16 injured were treated at the Medical College Hospital, sources in the hospital said.
Prafulla Mahanta, senior leader of Asom Gana Parishad, an
ally of ruling BJP, had visited the spot and lent his support to the agitators. To pacify them, Assam government then announced to set up an All India Institute of Ayurveda at Raha.
The agitation had been temporarily called off after Union Minister of State for Railways Rajen Gohain and BJP MP Ram Prasad Sarmah assured protesters of initiative to fulfil their demands.
During the Congress regime, the state had showed a number of locations, including Raha and Changsari to the Centre for setting up an AIIMS in Assam.