The U.K.-flagged Stena Impero, which has a crew of 23 aboard, “was approached by unidentified small crafts and a helicopter during transit of the Strait of Hormuz while the vessel was in international waters,” Stena Bulk, the shipping company that owns the vessel, said in a statement. “We are presently unable to contact the vessel which is now heading north towards Iran.”

Iran’s Revolutionary Guard forces, in a statement on their website, say the ship was seized for “non-compliance with international maritime laws and regulations” and is being brought to an unnamed Iranian port, according to the Associated Press. Websites tracking the ship’s path showed it turning sharply in the direction of Iran’s Qeshm Island, instead of its intended destination of Saudi Arabia.

“We are urgently seeking further information and assessing the situation following reports of an incident in the Gulf,” a U.K. government spokesperson told Fox News.

At about an hour later, a Liberian-flagged tanker operated by a British company was also seized by Iran’s Islamic Revolutionary Guard Corps (IRGC) and was seen on maritime tracking services making a turn toward Iran.

“I’m extremely concerned by the seizure of two naval vessels by Iranian authorities in the Strait of Hormuz,” British foreign secretary Jeremy Hunt said in a statement on Friday adding that the crews of both ships “comprise of a range of nationalities, but we understand there are no British citizens on board either ship.”

“Our Ambassador in Tehran is in contact with the Iranian Ministry of Foreign Affairs to resolve the situation and we are working closely with international partners,” Hunt said. “These seizures are unacceptable. It is essential that freedom of navigation is maintained and that all ships can move safely and freely in the region.”

United States President Donald Trump said on Friday that Iran is “nothing but trouble” and that “we heard one, we heard two,” tankers were seized.

“Iran is showing their colors,” the president told reporters before departing the White House to spend the weekend at his golf club in Bedmister, N.J. “Iran is in big trouble right now. Their economy is crashing, it’s coming to a crash … It’s very easy to straighten out or it’s very easy for us to make it worse.”

“This is the second time in just over a week the UK has been the target of escalatory violence by the Iranian regime,” National Security Council Spokesman Garrett Marquis said. “The U.S. will continue to work with our allies and partners to defend our security and interests against Iran’s malign behavior.”

The Pentagon had no official statement on the situation, but Fox News has learned that there are no current plans for U.S. naval vessels to escort commercial ships through the strait.

Stena Bulk says “there have been no reported injuries and their safety is of primary concern to both owners and managers.”