The BSE Sensex dropped 511 points, or 0.6%, to 80,954, halting gains from the previous two sessions, while the Nifty also fell 0.6% to around 24,700 after US President Donald Trump announced a 25% tariff on Indian imports. Almost all sectors traded in the red, led by oil & gas, which plunged 1.7% following Trump’s signals of further penalties over India’s energy ties with Russia. Traders also awaited Q1 results from companies including Coal India, Maruti Suzuki, Mahindra & Mahindra, and TVS Motors, all set to announce their results later today. Caution was also building ahead of key US economic data, such as jobs figures and PCE inflation. Among the bottom performers were Bharti Airtel (-1.6%) and Reliance Industries (-1.5%), while ICICI Bank, Bajaj Finance, and Infosys each fell around 1%. For the month, the index is heading for a 3.2% plunge - the first decline in five weeks - amid lingering US-India trade tensions.