The Federal Reserve's balance sheet crept higher in the latest week, as the central bank raised purchases of Treasury securities.

The Fed's asset holdings in the week that ended Sept. 23 increased to $2.16 trillion from $2.14 trillion the week prior, the Fed said in a weekly report released Thursday.

Total discount window borrowing slid to $109.98 billion on Wednesday from $111.88 billion a week earlier.

Borrowing by commercial banks through the Fed's discount window rose to $28.51 billion on Wednesday from $28.20 billion a week earlier. Borrowing by primary dealers through a credit facility created after the 2008 Bear Stearns collapse remained Wednesday at zero for a 21st week in a row.

The Fed's portfolio of Treasury securities in the latest week rose to $765.63 billion from $759.80 billion in the previous week.

The Fed's holdings in the Term Asset-Backed Securities Loan Facility fell to $41.88 billion from $43.56 billion a week earlier.

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