There has been no issuance of corporate bonds this week, a rare event. Typical issuance is over $20 billion per week.
In addition, the total amount of commercial paper outstanding fell by $52.1 billion in the week ended September 17th to $1.763 billion, the largest weekly decline since last December. The drop reflects the seizing up of the credit market that has occurred this week and withdrawals of monies from money market funds. The commercial paper market has been relatively stable since contracting sharply a year ago and in recent weeks had seen strong increases in the total amounts outstanding, so this latest decline marks an abrupt shift.