The accident occurred when a mortar shell landed near the area where the officers were viewing the training, Times of Israel reports.
Ground Forces Commander Major General Guy Tzur calls off all training following the incident.
The IDF is investigating the incident.
UPDATE: The soldier killed in the training accident has been named as Yishai Rosales, Times of Israel reports.
Rosales, an officer in the chareidi Netzach Yehuda unit, was killed when a mortar shell landed near him during training at the army’s Ze’elim base.
Another soldier was lightly injured.
Rosales’ family, which immigrated to Israel from Mexico several years ago, has been notified of his death.