The CNN Money Fear and Greed index remained in the "Extreme Fear" zone on Tuesday, despite almost no change in the overall fear level. The Nasdaq Composite gained over 100 points during the session as investors assessed developments in the Iran war. President Donald Trump declared that the US "does not need the help of anyone" after most NATO allies declined to join the military operation against Iran. The Federal Reserve began its two-day policy meeting, with a decision on the 3.75% fed funds rate expected. The index is a measure of current market sentiment based on the premise that higher fear exerts pressure on stock prices, while higher greed has the opposite effect.