The investigation appears to be linked to an admission by the app’s owner, ByteDance, that employees improperly obtained Americans’ data. The company said it had fired the workers involved.
A regulatory filing says officials have asked about software that Elon Musk, the CEO, said would allow cars to operate autonomously.
The administration said it successfully prevented victims from paying $130 million in ransom to Hive, a prolific ransomware gang, before taking over two of the group’s servers on Wednesday night.
Huawei has been a constant target of the US government since the administration of President Donald J. Trump.