The Pentagon on Monday released new photos and a time-line that it said bolstered U.S. accusations that Iran was behind a pair of attacks on oil tankers in the Gulf of Oman last week.

The report provides more details about the attacks that have heightened tensions between the U.S. and Iran, which has denied involvement in the incidents. President Donald Trump said last week "Iran did it," and U.K. officials said it is "almost certain" that Tehran was behind the attacks.

A Navy explosives expert who briefed reporters at the Pentagon said a mine placed above the waterline on the Kokuka Courageous was an indication that the attackers intended to damage the ship but not sink it.