A Navy SEAL from Long Island was killed and seven fellow service members were injured when their Humvee overturned during a training exercise, the Navy announced yesterday.

Wednesday’s accident at Fort Knox, Ky., took the life of Special Warfare Operator Third Class Jonathan Kaloust, 23, of Massapequa, said Lt. David Lloyd.

The cause of the accident is under investigation. No details have been released because of the exercise’s sensitive classification.

Kaloust’s unit, Virginia-based Naval Special Warfare Group Two, trains for missions involving counter-terrorism, reconnaissance and other assignments. He joined the group in March 2011.

Seven Marines were killed by a mortar explosion that also injured eight other service members in Nevada in March.