4 people have been killed and several injured after police resorted to lathicharge and firing as protests against Sterlite's industrial plan intensified in Tuticorin. Residents are demanding the closure of the plant, citing that the pollution it generates is causing serious health issues. The agitation against Sterlite Copper, which represents the copper unit of Vedanta Limited, recently escalated after the company announced the expansion of its unit in the city.