The US Bureau of Labor Statistics did not release September Consumer Price Index data on Monday as the ongoing federal government shutdown froze the agency's statistical operations. The report had been scheduled for October 12.

The shutdown, which began on October 1, has furloughed BLS staff and suspended collection and publication of key economic indicators. The September jobs report was already delayed earlier in the month, leaving markets and the Federal Reserve without critical readings on employment and prices.

Traders had looked to the CPI figure for guidance ahead of the Federal Reserve's late-October policy meeting. Economists at Goldman Sachs and JPMorgan had forecast headline inflation near 3 percent year-on-year before the data blackout removed the official benchmark.

The absence of reliable federal data has pushed investors toward private measures, including figures from ADP and the Cleveland Fed's inflation nowcast. A BLS spokesperson said publication dates would be reset once appropriations were restored and staff returned to work.

The data gap complicates the Fed's path on interest rates, with policymakers forced to weigh decisions using incomplete information. Markets remained volatile, with Treasury yields and equity futures reacting to the prolonged uncertainty.