Fifteen Marines were injured Wednesday when their amphibious landing vehicle was involved in an accident on land at Camp Pendleton, Calif.

Five of these Marines are in critical condition, according to a statement from the Marine Corps later in the day.

The accident happened during training about 9:30 a.m., California time, during what was described as "scheduled battalion training."

Eight Marines were medically evacuated to the Burn Center at University of California San Diego Health; three of these Marines are in critical condition while five are in serious condition.

Another four Marines have been taken to the University of California Irvine Medical Center. Two of these Marines are in critical condition while the other pair is receiving medical treatment "with an unknown medical condition," the statement said.

One individual was taken to Scripps Memorial Hospital La Jolla and is in stable condition, while the remaining two Marines are being treated at the Naval Hospital Camp Pendleton with minor injuries.

Officials are investigating the circumstances surrounding the incident, the Marines said.

"The 1st Marine Division would like to thank the civilian and military emergency personnel who responded immediately to the situation and allowed the injured Marines to receive rapid care," the statement said. "Our thoughts and prayers are with the Marines and their families affected by this incident."