Pentagon.

Seven Iranian fast attack boats harassed a US Navy ship in the Middle East over the weekend, the US department of Defence (Pentagon) said Tuesday. Pentagon spokesman Navy Capt. Jeff Davis said that the incident occurred Sunday in the Gulf waters. 

During the encounter, Iranian Revolutionary Guard Corps Navy fast attack craft approached the USS (Firebolt) when it was operating in international waters, Davis said. Three of the boats "maneuvered close to the ship, shadowing her course from a range of about 500 yards," Davis said. 

The boats eventually broke off, but one turned toward the Firebolt and came to a stop directly in front of the ship, causing the Firebolt to have to maneuver to avoid collision he added. "This is another example of another unsafe and unprofessional interaction we've had with the [Iranian navy] in the Gulf." he pointed. 

Source : QNA