Taiwan Semiconductor Manufacturing Co. discovered this month that chips it made for a specific customer ended up with Huawei Technologies Co., a potential violation of US sanctions intended to sever the flow of technology to a Chinese national champion.

Taiwan Semiconductor Manufacturing Co has suspended shipments to a customer after it discovered that one of its chips supplied to the client ended up in a Huawei product, according to a Taiwan official familiar with the situation.

In mid-October, TSMC opened an investigation after learning its chips were found in a Huawei product, Reuters reported. Shipments have been suspended to the client, a Taiwanese trade and economic official said, speaking on the condition of anonymity due to the situation’s sensitivity.