Colombian President Gustavo Petro told an audience in Colombia on Thursday "We are already being invaded." His comments come after the US seized a Venezuelan oil tanker.

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.

U.S. military seizes Venezuelan oil tanker in rare operation targeting sanctions violations. Armed agents rappelled from helicopters in dramatic takedown.