The Pentagon has prohibited the sale of Huawei and ZTE phones on U.S military bases worldwide, taking aim at two of China’s most prominent technology firms as concerns swell over the potential national security risks posed by their products.

“Huawei and ZTE devices may pose an unacceptable risk to Department’s personnel, information and mission,” U.S. Department of Defense spokesman Maj. Dave Eastburn said in a statement. “In light of this information, it was not prudent for the Department’s exchanges to continue selling them to DoD personnel.”

The order doesn’t stop military personnel from using or bringing the phones on base, but service members “should be mindful of the security risks posed by the use of Huawei devices, regardless of where they were purchased,” the Pentagon spokesman said Wednesday.

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