The US has imposed fresh sanctions on six more ships said to be carrying Venezuelan oil, a day after seizing a tanker off the country's coast.
Sanctions have also been placed on some of Venezuelan President Nicolás Maduro's relatives and businesses associated with what Washington calls his illegitimate regime.
White House press secretary Karoline Leavitt told reporters the seized vessel, called the Skipper, had been involved in "illicit oil shipping" and would be taken to an American port.
Caracas has described it as an act of "international piracy".
It marks a sharp escalation in the US pressure campaign against Maduro, which has seen dozens killed in strikes on boats alleged to have been carrying drugs from Venezuela. In recent months American warships have been moving into the region.
