A sell-off for stocks is slamming into Wall Street after wrapping around the world, as oil prices leap even higher on worries that the widening war with Iran may do more sustained damage to the economy than feared.

Key Levels for S&P 500 and Nasdaq Composite After Trump Defends Iran Conflict

The price of a gallon of gas spiked overnight in the U.S., and drivers overseas are filling up tanks

Dow drops nearly 300 after trimming an earlier plunge of 1,200 as oil prices leap even higher

Dow drops 500 as stocks sell off around the world and oil prices leap even higher on war worries

Better S&P 500 ETF: State Street's SPY vs. Vanguard's VOO