US attacks on Iran will hit a new intensity Tuesday and the war will continue as long as President Donald Trump decides, Pentagon chief Pete Hegseth said.

"Today will be yet again, our most intense day of strikes inside Iran -- the most fighters, the most bombers," Hegseth told a news conference at the Pentagon more than 10 days into the US-Israeli war against the Islamic republic.

As for a timeline for the war, Trump "gets to control the throttle. He's the one deciding," Hegseth said.

"It's not for me to posit whether it's the beginning, the middle or the end," the defense secretary said.

Trump had said the previous day that the war could end "very soon," but remained vague.

Among the goals is destruction of Iran's navy, which has been targeted with "artillery, fighters, bombers and sea-launched missiles," General Dan Caine, the top US military officer, said alongside Hegseth on Tuesday.

Iran has vowed to block all oil exports via the Gulf while the war lasts, while Trump has threatened "death, fire, and fury" if Tehran interferes with crude exports.