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Peri Sagun, 13, and her sister were simply trying to relax as they strung a hammock between a tree and a brick light post outside their home. Then, unimaginable tragedy struck.

(Screen shot/KCRG)

A 13-year-old girl and her sister were simply trying to relax as they strung a hammock between a tree and a brick light post outside their Des Moines, Iowa, home last weekend. Then, unimaginable tragedy struck.

The Des Moines Register reports that the five-foot brick light post gave way when Peri Sagun, 13, jumped on that side of he hammock, with her older sister already seated on the other end.

The additional weight on that side of the hammock caused the brick post to collapse onto the younger girl's head.

Her 16-year-old sister, sitting on the hammock's opposite end, was unhurt, and she ran inside the house for help, the newspaper reports.

Despite CPR and first aid administered by Peri's father, the girl died at 12:52 p.m. Saturday after being rushed to a nearby hospital, the newspaper reported, citing the police report in the case.