Layoff announcements soared in October as companies recalibrated staffing levels during the artificial intelligence boom, a sign of potential trouble ahead for the labor market, according to outplacement firm Challenger, Gray & Christmas.

Job cuts for the month totaled 153,074, a 183% surge from September and 175% higher than the same month a year ago. It was the highest level for any October since 2003. This has been the worst year for announced layoffs since 2009.

“Like in 2003, a disruptive technology is changing the landscape,” said Andy Challenger, workplace expert and chief revenue officer at the firm. “At a time when job creation is at its lowest point in years, the optics of announcing layoffs in the fourth quarter are particularly unfavorable.”

The report provides a glimpse into the labor market at a time when the government has suspended data gathering and releases during the shutdown in Washington, D.C.

To be sure, the Challenger monthly numbers can be highly volatile, and an accelerated pace of layoffs has yet to show up in state-level weekly jobless claim filings that continue to come in despite the shutdown. Payrolls processing firm ADP reported that October saw net job growth of 42,000, reversing two consecutive months of losses in the private sector.