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ST. LOUIS (AP) — Two young cousins were livestreaming from a St. Louis apartment when one child fatally shot the other before killing herself in what family members say was a tragic accident.

Police are still investigating Friday’s incident in which a 12-year-old girl, Paris Harvey, shot a 14-year-old boy, Kuaron Harvey, before shooting herself. Police initially described it as a murder-suicide.

The girl’s grandmother, Susan Dyson, told the St. Louis Post-Dispatch that she saw the Instagram Live video the two cousins were making together. She says they were playing with a gun when it went off.

Family members said that Kuaron was shot first. Then the video showed Paris reaching for the gun and it may have accidentally gone off again.