US forces in the Caribbean Sea have seized another sanctioned oil tanker that the Trump administration says has ties to Venezuela, part of a broader US effort to take control of the South American country's oil.

US Homeland Security Secretary Kristi Noem wrote on social media that the US Coast Guard had boarded the Motor Tanker Veronica early on Thursday.

She said the ship had previously passed through Venezuelan waters and was operating in defiance of US President Donald Trump's "established quarantine of sanctioned vessels in the Caribbean.”

US Southern Command said Marines and sailors launched from the aircraft carrier USS Gerald R Ford to take part in the operation alongside a Coast Guard tactical team, which Noem said conducted the boarding as in previous raids.

The military said the ship was seized “without incident.”

Noem posted a brief video that appeared to show part of the ship's capture. The black-and-white footage showed helicopters hovering over the deck of a merchant vessel while armed troops dropped down on the deck by rope.

The Veronica is the sixth sanctioned tanker seized by US forces as part of the effort by Trump's administration to control the production, refining and global distribution of Venezuela's oil products and the fourth since the US ouster of Venezuela President Nicolás Maduro in a surprise night-time raid almost two weeks ago.

The ship is currently listed as flying the flag of Guyana and is considered part of the shadow fleet that moves cargoes of oil in violation of US sanctions. (AP)