WASHINGTON (AP) — Thousands of employees returned to the Food and Drug Administration's headquarters Monday to find overflowing parking lots, long security lines and makeshift office spaces without chairs and other basic supplies.

The FDA is the latest agency scrambling to meet the Trump administration's return-to-office mandate, part of a flurry of actions — including firings and buyouts — intended to radically shrink the federal workforce. Monday was the first day that all rank-and-file FDA staffers were required to report to offices, including the agency's 130-acre campus just outside Washington.

The Associated Press spoke with more than a half-dozen FDA staffers who described long lines to park and clear security, followed by hours of hunting for space and supplies in offices that were not designed to accommodate the agency’s full workforce. The staffers spoke on condition of anonymity because they were not authorized to speak with the media.

One staffer described “chaos and lost work hours" for commuting, security lines and shuffled office space.

About half the FDA’s 20,000 scientists, attorneys, inspectors and support staff report to the agency’s main campus in White Oak, Maryland, which until the late 1990s was a naval weapons testing facility.

While many agencies switched to telework work during the COVID-19 pandemic, the FDA began embracing the practice a decade earlier. Most employees had the option to work from home at least two days a week — flexibility that was seen as a competitive perk for recruiting highly trained experts who can often earn more working in industry.

By 7:30 a.m., many on-campus parking lots were full, with cars parked along side streets, according to employees. Some workers reported waiting up to one hour to clear security checkpoints, and photos viewed by the AP showed lines of employees winding out doorways, along sidewalks and around corners.

Once inside, employees confronted broken desks, missing chairs and locked offices for which they didn’t have keys.

“All of the staff is definitely bending over backwards to make an impossible situation work and get their work done,” said one employee.

Some employees were left to scour the campus for chairs and other essentials.

“People are looting chairs from conference rooms and other buildings,” a staffer said. “We have no supplies. People are hunting around all of the buildings on campus for pads of paper and other basics.”

When employees did get situated, many shared cramped spaces with people from different divisions and teams, making it difficult to hold calls and meetings. Photos shared with the AP show folding chairs and tables setup in hallways and lobbies.

An FDA spokesman said in an email Monday the agency is “is continuing its return-to-office activities to ensure staff remain able to conduct their important public health work.”

All the employees told the AP that they brought their own drinking water Monday. That's due to a monthslong issue involving Legionella, the bacteria that causes Legionnaires' disease, which was detected at several FDA buildings. The General Service Administration, which oversees federal buildings, has been working on the issue since last summer.

FDA staff received an email earlier this month that all water is safe to drink, but it did not detail the latest testing results or corrective actions taken.

Anthony Lee, who represents the local chapter of the federal union for FDA employees, said the agency has not granted the union's request for a meeting on the issue.

Asked about the water, one staffer said: “Honestly, none of us have tried it. After months of Legionella warnings, it’s not very inviting."

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group and the Robert Wood Johnson Foundation. The AP is solely responsible for all content.