Up to 10% of NASA employees are out of work nationwide as a result of federal buyouts and the firing of probationary workers, multiple news agencies reported Tuesday.

ABCNews, citing unnamed sources in the space agency, reports 10% of the workforce has been laid off. ArsTechnica reports about 1,000 workers were impacted by the culling of probationary workers, and another 750 accepted the deferred resignation offer put forward by the Donald Trump administration in a January executive order.

The space agency employs about 18,000 people nationwide.

A spokesperson for the Marshall Space Flight Center did not immediately respond to questions about the scale and impact of the workforce reductions in Huntsville.

Marshall is one of the largest of NASA’s 10 field centers, employing thousands in north Alabama and managing a multibillion-dollar budget for programs related to human spaceflight, like the Artemis moon program.

Also Tuesday, the Planetary Society released an open letter to the Trump administration, “following reports that every probationary employee at NASA will have their employment abruptly terminated.” The society calls itself “the world’s largest and most influential space advocacy organization,” with more than 2 million members.

“While we recognize the value of improved efficiency and structural optimization, any workforce changes should be in service of improving the agency’s ability to execute its mission,” the organization wrote. “Indiscriminate layoffs do not serve this purpose.”

Probationary employees are typically new hires to a federal agency. The Trump administration directed agencies last week to begin releasing probationary workers, of which there are an estimated 200,000 across the federal government.