Federal agents are probing the recent spate of suicides committed by sailors assigned to the USS George H.W. Bush — including a fourth case in July, according to a report.

Authorities began investigating the suicide of Machinist’s Mate 3rd Class Robert John Bartulewicz III in July, but federal agents launched a new probe after three other sailors from the same aircraft carrier killed themselves last week, the Navy Times reported.

The sailors were identified as Chief Electronics Technician James Harold Shelton, Aviation Ordnanceman 1st Class Vincent Michael Forline and Airman Ethan Thomas Lee Stuart.

Navy officials rejected suggestions that the cases point to an “epidemic,” the Navy Times reported.

“The sailors did not serve in the same departments, and there does not appear to be a connection between their deaths,” Cmdr. Jennifer Cragg told the outlet.

None of the deaths occurred on the aircraft carrier, which is docked at the shipyard for repairs, the Navy Times reported. One of the sailors died Sept. 14, while two others killed themselves in separate incidents Sept. 19.

Between Jan. 1 and Sept. 5, there have been 46 active duty members in the Navy and four reservists who have died by suicide, the outlet reported. The previous year, there were 68 cases ruled suicides, records showed.

Cragg said counselors and psychologists have been made available to the crew in the wake of the deaths.

“As a crew and as a family, they are grieving,” Cragg said. “They are supporting each other, and are comforting those in need.”