China's Ban on Micron Chips Raises Security Concerns

China has banned US chipmaker Micron Technology's products from being purchased by operators of key infrastructure, citing "serious network security risks". The move follows a seven-week investigation into Micron by the Cyberspace Administration of China (CAC), which was seen as retaliation for US efforts to curb China's access to critical technology. Micron is the biggest US maker of memory chips and China is an important market for the company. The US Department of Commerce has opposed the action, which it said had "no basis in fact".