3-year-old girl kills 4-year-old sister in accidental shooting at Texas home: "Our hearts are broken"

A 3-year-old girl found a loaded gun in a Texas home and accidentally shot her sister, killing the 4-year-old on Sunday, police said. Harris County Sheriff Ed Gonzalez said the girls were in the bedroom of an apartment on Bammel North Houston Road in Houston, where they lived with their parents, around 8 p.m.

Five adults, who were all family members or family friends, were in other parts of the apartment and the girls unintentionally were left unsupervised, Gonzalez said. 

He said one parent thought the other was watching the girls, and they were left alone in a bedroom. The 3-year-old girl found a loaded pistol and fired a single shot, the sheriff said.