The New York Fed will conduct a $500B 3-month repo operation at 1:30 pm ET, among others. They will also expand Treasury purchases beyond bills — that's fresh QE. That's a big number. It's good the Fed is on the ball but it also suggests there are major liquidity strains.
Someone on CNBC noted that municipal bonds are being sold. That isn't mom & pop investors adjusting their portfolios: It's someone who needs liquidity.