The U.S. is preparing to intercept more ships transporting Venezuelan oil following the seizure of a tanker this week, as it increases pressure on Venezuelan President Nicolas Maduro, six sources familiar with the matter said on Thursday.

The seizure was the first interdiction of an oil cargo or tanker from Venezuela, which has been under U.S. sanctions since 2019. It came as the U.S. executes a large-scale military buildup in the southern Caribbean and as U.S. President Donald Trump pushes for Maduro's ouster.