(Bloomberg) — The Trump administration fired hundreds of employees at the top US agency overseeing weather prediction and climate research, raising concerns about the nation’s preparedness amid wildfire and tornado warnings.

The cuts affect the US National Oceanic and Atmospheric Administration, which includes the National Weather Service and a vast observational system that supplies free data to commercial forecasters. The move is part of a broad effort by the administration to shrink the size of the federal government.

At least 880 people were terminated, Senator Maria Cantwell, the ranking member on the Senate Committee that oversees the agency, said in a statement Thursday. Hundreds more are expected to be let go at NOAA as soon as Friday, according to people familiar with the matter who asked not to be named because the information is private.

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