The United States on Wednesday sanctioned a group of mainland Chinese and Hong Kong shipping companies accused of operating vessels that transported Iranian oil to China, extending Washington’s economic campaign against Tehran alongside its naval blockade. The US State Department said eight companies were designated for operating vessels that moved Iranian crude oil and petrochemical products to China and the United Arab Emirates as part of Iran’s sanctions-evading “shadow fleet”. The designations freeze any assets belonging to the targeted companies within US jurisdiction and generally prohibit US individuals and businesses from dealing with them. Foreign financial institutions and other companies could also face sanctions exposure if they continue to conduct certain transactions involving the designated firms. “Today’s designations support the US Navy’s enforcement of a blockade on Iranian ports and coastline,” State Department spokesman Tommy Pigott said.