TSMC has advised the U.S. that there was an attempt by Huawei to violate sanctions against China restricting the export of AI chips to China, as the probe that could affect Apple chip production rolls on.

Taiwan Semiconductor Manufacturing Company (TSMC) said on Tuesday it has informed the United States of a potential attempt by Huawei to circumvent U.S. export controls prohibiting the chipmaker from producing AI chips for the Chinese company.

An investigation of Huawei Technologies Co.’s latest AI offering has unearthed an advanced processor made by Taiwan Semiconductor Manufacturing Co., suggesting that China is still struggling to reliably make advanced chips in sufficient quantities.