Iran's Islamic Revolutionary Guard Corps (IRGC) seized a British ship in the Strait of Hormuz, adding to escalating tensions between Tehran and the Trump administration.

FARS, Iran's semi-official news agency, confirmed the capture of the British vessel and said Iranian naval forces detained a Liberian-flagged ship but later released it.

President Donald Trump declined to say whether the moves by Iran crossed a "red line" or how the U.S. might respond. But he noted that the U.S. has a maritime security agreement with the United Kingdom.

"It goes to show you I was right about Iran," Trump told reporters at the White House.

» USA TODAY delivers current local and national news, sports, entertainment, finance, technology, and more through award-winning journalism, photos, videos and VR.

More videos