<h1>Markets tumble after government announces 100% tariff on major trading partner, sparking sector sell-offs and supply-chain disruption</h1> Benchmark indices fell after a government announced an additional 100% tariff on imports from a major trading partner effective November 1, triggering heightened trade tensions and risk-off investor sentiment. The tariff announcement and concurrent geopolitical developments coincided with declines in major indices, sectoral sell-offs in IT and FMCG stocks, and mixed performances across financial and infrastructure firms. Legal implications include potential escalation of trade disputes under international trade agreements, heightened regulatory scrutiny of cross-border transactions, supply-chain disruptions affecting corporate compliance and disclosure obligations, and possible market volatility risks for institutional and retail investors. Foreign institutional inflows remained positive amid volatility.