The U.S. Navy on Saturday released footage it said showed Iranian Revolutionary Guard vessels firing rockets near warships and commercial traffic in the strategic Strait of Hormuz late last month, a move raising tensions between the two nations despite the recent nuclear deal.

The Navy said it released the footage in response to a Freedom of Information Act request, though it also comes as U.S. ally Saudi Arabia has cut ties to the Islamic Republic following attacks on diplomatic posts there after the kingdom's execution of a Shiite cleric.

The 45 seconds of black-and-white Dec. 26 footage, which the Navy said was shot from a Seahawk helicopter, shows what appears to be an oil tanker passing by. A flash appears on the left side of the video and after zooming in, it shows small boats the Navy said were Iranian firing rockets.

The Navy has said the USS Harry S. Truman aircraft carrier, the USS Bulkeley destroyer and a French frigate were nearby at the time, as well as commercial vessels.

There was no immediate reaction in Tehran to the video's release. Previously, Gen. Ramezan Sharif, a Revolutionary Guard spokesman, said his forces didn't carry out any drills there at that time and called the American comments "psychological warfare."

Military vessels taking part in the war against the Islamic State group in Iraq and Syria also pass through the strait, a narrow waterway between Iran and Oman. The U.S. Navy previously said Iran gave 23-minutes warning over maritime radio before opening fire with unguided rockets.

The Strait of Hormuz is only about 33 kilometers (21 miles) wide at its narrowest point. Ships traversing the chokepoint have even less room to maneuver. The shipping lane in either direction is only 2 miles (3.22 kilometers) wide, with a 2-mile (3.2-kilometer) buffer zone between them.

The U.S. Navy's 5th Fleet is based in nearby Bahrain, on the southern coast of the Gulf. It conducts anti-piracy patrols in the greater Gulf and serves as a regional counterbalance to Iran.

U.S. and Iranian forces clashed in the Strait of Hormuz in the 1980s, during the Iran-Iraq war. On April 18, 1988, the U.S. attacked two Iranian oil rigs and sank or damaged six Iranian vessels, including two naval frigates, in Operation Praying Mantis. That came after the near-sinking of the missile frigate USS Samuel B. Roberts by an Iranian mine.

A few months later, in July 1988, the USS Vincennes in the strait mistook an Iran Air flight heading to Dubai for an attacking fighter jet, shooting down the plane and killing all 290 passengers and crew onboard. The shoot-down of the jet came shortly after the U.S. vessel reported coming under fire from Iranian speedboats.

Tensions have persisted in the strait even into this year. Iran sank a replica of a U.S. aircraft carrier in February near the strait and it earlier tested out so-called "suicide drones" it said could crash into naval vessels.

Iran seized a Marshall Islands-flagged cargo ship and later released it in May after its forces had earlier surrounded a U.S.-flagged cargo ship transiting the strait. That caused the 5th Fleet to escort commercial ships traveling in the Gulf for a short time.

Iran and world powers led by the U.S. agreed to a landmark nuclear deal earlier this year to limit Tehran's enrichment of uranium in exchange for lifting economic sanctions. Iran has always denied seeking nuclear arms.

The deal reached with moderate President Hassan Rouhani's administration has been panned by Iranian hard-liners, and in the months since, Iran has conducted missile tests criticized by the U.S., as well as aired footage on state television of an underground missile base.

In recent days, regional tensions have been escalated even higher as Iran and Saudi Arabia face off after the execution of Sheikh Nimr al-Nimr and the storming of the kingdom's diplomatic posts in Iran. (ags)

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