The search for twelve Marines who were involved in a helicopter crash just off the Hawaiian island of Oahu continues.

Reports say two CH-53 helicopters appear to have gone missing during a training flight on Thursday evening. Coast Guard spokesman Lt. Scott Carr said, “No mayday call was received, just word that something had gone wrong.”

Witnesses say they remember seeing a fireball in the distance, while investigators spotted a debris field about two miles north of Haleiwa Beach. Six people were on board each aircraft.

Investigators are faced with a difficult search, as waves up to 30 feet continue to spread out debris and evidence. Among the missing are four officers and eight enlisted Marines.

We pray for their families during this difficult time and will continue to keep you updated as more news surfaces. Click here for more information on the missing Marines.

SOURCE: CNN | VIDEO/PHOTO CREDIT: Inform, Getty