BEIJING (AFP) -- China's cybersecurity watchdog said Sunday US chipmaker Micron Technology had failed a national security probe and urged all operators of critical information infrastructure to stop purchasing their products as Beijing tightens enforcement of national security and anti-espionage laws.

Micron's products "have relatively serious potential network security issues, which pose a major security risk to China's critical information infrastructure supply chain and affects China's national security," the cybersecurity administration said in a statement.