The Honolulu Fire Department is investigating an accident during a training operation in which two firefighters were injured, one critically, this morning in waters off Diamond Head.

The accident occurred at 10:45 a.m. during a rescue watercraft training operation.

HFD issued a short media release saying that one firefighter remains in critical condition and another was treated and released at a local hospital.

HFD Capt. David Jenkins said he could not release any further details than what was contained in the news release.

Fire Chief Manuel Neves said in a written statement: “On behalf of the members of the Honolulu Fire Department, our thoughts and prayers are with the injured firefighter. We ask the public for their continued respect for the privacy of the firefighter and his family.”

The Fire Department will provide more information when it becomes available.

A high surf advisory was in effect for south shore waters. Forecasters said wave heights of 5 to 8 feet were expected today.