U.S. equity funds witnessed robust outflows in the seven days to Sept. 27 on worries about a potential extension of the Federal Reserve’s restrictive monetary policy and a renewed surge in Treasury yields.

According to LSEG data, U.S. equity funds suffered outflows of a net $11.69 billion, the biggest of any week since June 21.

Investors were concerned about U.S. borrowing costs as remarks from several Fed officials reaffirmed a longer period of tighter policy to tame inflation.