The violence broke out on Wednesday during 'Tribal Solidarity March' called by All Tribal Student Union Manipur (ATSUM) in Torbung area of Churachandpur district to protest the demand of non-tribal Meiteis, who dominate the Imphal Valley, for Scheduled Tribe (ST) status. Thousands of agitators took part in the rally, during which clashes between tribals and non-tribals broke out, a senior police officer said.