The United States imposed sanctions on six entities based in Hong Kong and China on Wednesday that it accused of being involved in an Iranian drone procurement network, as the Trump administration implements its "maximum pressure" campaign against Tehran.

The Treasury claimed that the Hong Kong entities procured components for Iranian firm Pishtazan Kavosh Gostar Boshra and its subsidiary, Narin Sepehr Mobin Isatis, which were known for supplying Iran’s drone and ballistic missile programmes and remained under US sanctions.

The U.S. Treasury Department's Office of Foreign Assets Control Wednesday sanctioned six Hong Kong companies for allegedly being part of a covert Iranian drone procurement network.

The United States on Wednesday imposed sanctions on six entities based in Hong Kong and China that it accused of being involved in an Iranian drone procurement network. This was as the Trump’s administration implements its maximum pressure campaign against Tehran.