Eight U.S. Marines were injured two weeks ago when an Iranian cruise missile attacked the ship they were operating on in the Strait of Hormuz, NBC News reported Sunday, citing three US officials.

Axar.az informs according to tha report, the marines were not seriously injured, but they sustained smoke inhalation and possibly traumatic brain injuries, as they had symptoms of concussions, such as headaches, the officials said.

Seven of the Marines were enlisted personnel, while the eighth was an officer. All eight returned to duty shortly after the Sept. 14 attack, according to the officials.

The officials said the vessel was not a US Navy ship but declined to specify its type, referring to it only as a maritime vessel.

The eight Marines were added to the database nearly 10 days after the Sept. 14 attack, while a US official attributed delays in reporting to symptoms that may appear later and the system’s lack of real-time updates.