London (CNN Business) The European Union has warned that 5G networks could be left vulnerable to attack from state-backed hackers if operators use too many parts from a single supplier.

A report from the bloc released Wednesday says that mobile network operators should not rely too heavily on suppliers that have "a strong link" to governments that lack "democratic checks and balances."

"In this context of increased exposure to attacks facilitated by suppliers, the risk profile of individual suppliers will become particularly important," EU officials said in a statement.

While the document does not specifically mention China's Huawei, its publication follows an intense campaign by the United States designed to discourage allies from using the company's 5G equipment.

The United States says that Huawei products pose a national security risk because they could be used by Beijing for spying. Huawei has denied the accusations, and called on the Trump administration to provide evidence to back up its claims.

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