New Delhi, March 18 -- A selloff in Wall Street's largest technology companies dragged down the stock market, with investors also gearing up for Wednesday's Federal Reserve decision that will likely bring an assessment of how President Donald Trump's trade policies are impacting the economy.

Equities halted a back-to-back rally from technically oversold levels. The cohort of tech megacaps dubbed "Magnificent Seven" hit the lowest since September, with Tesla Inc. down 6% Nvidia Corp. falling 3.5% in the run-up to chief Jensen Huang's keynote speech.

Tesla was one of the heaviest weights on the market after falling 6.1%. The electric-vehicle maker's stock has been struggling on worries that it will lose sales because of anger at its CEO, ...