Three high-speed IRGC boats came directly towards the USS Sirocco and USNS Choctaw County, getting as close as 50 yards, the report said on Monday, citing a US military official. Audible warning signals and a warning flare were deployed by the US ships, the report added.
The encounter, which lasted approximately one hour, concluded with the IRGC boats leaving the area, according to the report.
The Iranian vessels acted in a way that "did not meet the international standards of professional or safe maritime behavior," US Central Command spokesman Col. Joseph Buccino was quoted as saying in the report.
US forces will continue operations at air and at sea anywhere international law allows in order to promote regional stability, Buccino also said.