A South Korean conscript who went on a deadly shooting rampage had been humiliated by fellow soldiers who mocked him and drew cartoons depicting him as SpongeBob SquarePants, military officials say.
The 22-year-old sergeant surnamed Lim opened fire on members of his own unit at a guard post near the tense border with North Korea on June 21, killing five and wounding seven.
He was captured alive two days later after he shot himself in the chest in a failed suicide attempt following a 24-hour standoff with thousands of troops.
Announcing the result on Tuesday of a formal probe into the case - including lengthy interviews with the shooter - senior military investigator Seon Jong-Chul said Lim had faced repeated mockery by both lower and higher-ranking members of his unit.
On the day of the shooting, he had been especially enraged by cartoons drawn on the back pages of the unit's daily border patrol logs, depicting Lim as a series of goofy, immature cartoon characters, including SpongeBob.
"Other troops saw it as a small joke, but (Lim) said he had been greatly distressed by it," Seon said, adding that the cartoons had "triggered a flashback" to when Lim was bullied in high school.
Although other soldiers in the unit were also caricatured in the log book, Lim took the cartoons depicting him as a personal attack.
The South Korean armed forces rely heavily on the military service system, with conscripts - most in their early twenties - accounting for the lion's share of its 690,000 active personnel.
Psychiatric experts say the pressures facing the young servicemen can be daunting when, after what is often quite a cosseted childhood and teenaged youth, they are suddenly plunged into a world of harsh military discipline.
Barrack-room bullying of fresh conscripts used to be rampant and has been blamed for a number of suicides and similar shooting sprees in the past.
Following hospital treatment for his self-inflicted gun wound, Lim was formally arrested earlier this month on multiple charges including murder, attempted murder, and stealing military equipment.
Before shooting himself, Lim had written a brief note - released by the military on Tuesday - which reflected feelings of persecution and inadequacy.
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