Online video shows 12-year-old girl fatally shooting 14-year-old cousin and herself at birthday party

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.

"We are sending our heartfelt condolences to the family," St. Louis Police said in a Facebook post identifying the two children.

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 at a downtown St. Louis apartment the family had rented to celebrate March birthdays.