The US Naval Institute reports that the Iranian Navy attempted to stop two tankers in the Gulf of Oman. In the second case, shots were fired. In both cases, the Iranian warships departed when US destroyer USS McFaul (DDG-74) arrived on scene.
The Iranian warship that fired on the tanker was armed with a 76mm gun and apparently anti-ship cruise missiles, but additional CNN coverage indicates the weapons fired were “small arms.” There was only minor damage to the tanker and no personnel casualties.
The Iranian vessel seen in the video is one of four Bayandor class corvettes (apparently Bayandor itself) built in Orange, Texas. Two of the class are believed to have been lost to Iraqi force 1982-83. The two remaining ships were commissioned into Iranian service in 1964. They have a full load displacement of 1,135 tons and are 275 feet (83.82 meters) in length with a speed of 20 knots.
Iranian Navy Bayandor (PF-103) class corvette. 29 December 2019. Photo credit: mehrnews via Wikipedia.
Chuck Hill's CG Blog 
Another report with additional detail. https://apnews.com/article/gulf-iran-us-tensions-shipping-oil-127f8b77aa7e41dcd8266b6fbe5800dc?utm_source=facebook&utm_medium=news_tab&fbclid=IwAR12xA3BPvFEBvSEDQzABiSJ1DhgQHgoNb_on2mKFQmAZBIfZZF2ns43igM
Actually, it looks like the tankers were not in the Strait of Hormuz as indicated in the title.
Praying Mantis 2 time?
Agreed.
Yes! Focused on the assets IRGC uses to harass shipping.
Someone with combatants older than some of our cutters! Those corvettes are almost 60 years old, though ‘modernized’.
Yes, these are the same age as the oldest of the 210s. The three oldest were also commissioned in 1964.