A youth named Harsha, an activist for Bajrang Dal, was killed in Shivamogga on Sunday night.
The District Administration has imposed Section 144 across the city.
Harsha was a tailor in Seegehatti, Shivamogga. According to a prominent media outfit, Harsha’s communal posts on social media could be the trigger.
The District administration announced a holiday for schools and colleges.
Police have yet to arrest the culprits and confirm the reason for the killing.