The U.S. labor market is showing further signs of weakening as the pace of layoffs has picked up over the past four weeks, payrolls processing firm ADP reported Tuesday.

Private companies lost an average of 13,500 jobs a week over the past four weeks, ADP said as part of a running update it has been providing. That's an acceleration from the 2,500 jobs a week lost in the last update a week ago.

With the government shutdown still impacting data releases, alternative data like ADP's has been filling in the blanks on the economic picture.

Government agencies such as the Bureaus of Labor Statistics and Economic Analysis have released revised schedules, but critical reports such as the monthly nonfarm payrolls count won't come out until December.

Policymakers at the Federal Reserve won't ha

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