FedEx officially apologized on Tuesday for “mis-transportation” of some Huawei parcels to the US, which were originally addressed to Huawei’s Asia offices.

FedEx noted that “there are no external parties” involved and the “mis-transportation” involved only “an isolated number” of Huawei shipments, according to a statement on the US logistic giant’s microblog page in China.

FedEx was accused of re-routing Huawei packages to the US without any authorization amid the US government’s tightening ban on Huawei.

Two packages Huawei sent from Japan and bound for mainland China were re-routed to the US, the Chinese technology giant claimed, adding that FedEx has attempted to divert two more packages which were sent from Vietnam to Huawei Hong Kong and Singapore offices.

A Huawei spokesperson said the incident has “undermines our confidence” over FedEx and it is forced to “review” its relationship with the courier.