At about 9:30 a.m., an "amphibious landing vehicle" was involved in an accident on the base during battalion training, according to a news release from 1st Marine Division Public Affairs.
The incident comes more than a month after a training accident left one Marine dead at Camp Pendleton. "Officials are investigating the circumstances surrounding the incident at this time".
The extent of their injuries is not yet known.
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The publication also reported that three of the Marines were taken by helicopter to a local hospital for treatment of their injuries. He was deployed with the 11 Marine Expeditionary Unit in early 2016. When medics arrived, they tried to resuscitate the Marine, but it was too late.
In 2015, a Marine was discovered dead at a shooting range on the base; he was participating in a training exercise in which live ammunition was used.
No other information was available.