FILE PHOTO: Federal Express Trucks Down Highway in San Diego, Calif. 22 August 2014 Reuters / Mike Blake / Photo of the file
"This package was wrongly returned to the sender and we apologize for this operational error," said FedEx in a statement sent by email. A company spokesman confirmed that the package was related to the US, but declined to say what it contained.
Huawei, the world's largest telecoms maker, is at the center of the controversial trade dispute between Washington and Beijing. China has begun a FedEx investigation earlier this month to supply Huawei to the wrong address without giving details of the supplies in question.
The Chinese State News Agency, Xinhua, said then that FedEx's erroneously sent mail investigation should not be seen as a vengeance against the US company, against the background of a commercial satellite.
The United States and China have been involved in business litigation for months on issues such as tariffs, subsidies, technologies, regulations and cyber security, among others, as Washington put Huawei on a blacklist last month citing national security.
"FedEx can accept and ship all Huawei products, except for any shipments to the listed Huawei listed companies," the company said on Sunday.
Omitting supplies were reported earlier than the Chinese Global Tab, published by the ruling People's Daily Communist Party.
On Friday, the US Department of Commerce said it added several Chinese companies and state institutes involved in supercomputers with military applications to their national security list, which forbids them to buy parts and components of the US without government approval.
Huawei, who said he was reconsidering his relationship with FedEx after having previously committed wrongdoing, did not respond immediately to Reuters's request for comment on Sunday.
Reporting by Kanishka Singh in Bengaluru; Editing by Muralikumar Anantharaman