Specifically, the Fed conducted repurchase agreement (repo) transactions to provide immediate liquidity to the market and help alleviate the funding strains, ensuring the federal funds rate resumed trading within the target range. In addition, the FOMC judged that the prevailing level of reserve supply at that time may have been a bit too low to be consistent with operating in an ample-reserves regime.
Accordingly, in early October 2019, the FOMC directed the  - 11 Fed to maintain over time reserve balances at least as large as the level that had prevailed in “early September,” a time when there were no evident pressures in money markets.