U.S. Customs and Border Protection (CBP) officers seized a package thought to contain counterfeit coronavirus (COVID-19) test kits at Los Angeles International Airport (LAX) on Thursday.

The package arrived from the United Kingdom, according to a CBP press release.

CBP officers discovered six plastic bags containing various vials, the agency said. After further examination, they found the vials filled with a white liquid and labeled “Corona Virus 2019nconv (COVID-19)” and “Virus1 Test Kit," the agency said.

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The samples were then given to the Food and Drug Administration (FDA) for testing.

“Protecting the health and safety of the American people is a top priority for CBP,” said Carlos C. Martel, CBP Director of Field Operations in Los Angeles.

“This significant interception, at a time when the U.S. is in the midst of a National Emergency, demonstrates our CBP officers’ vigilance and commitment to ensure dangerous goods are intercepted and not a threat to our communities and our people.”

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The release went on to warn Americans against false testing kits and said testing for coronavirus is done at "verified state and local public health laboratories across the United States."