Investigators have not yet determined who fired the gunshots into a southwest Atlanta home, killing a 2-year-old and injuring her infant brother, Atlanta police said Monday.

But the reward has increased to $5,000 for information regarding the early Saturday shooting, according to police. And the children’s mother is pleading for the person responsible to surrender.

“The person who did this, please just turn yourself in because my baby didn’t know what was going on,” Sylvia Motley told Channel 2 Action News. “Just please turn yourself in because it hurts me each and every day.”

Police have said someone fired at least two gunshots through the front door of the family’s home on Polar Rock Place around 1:40 a.m. Saturday.

The bullets struck Ty-Teyanna Motley and her one-year-old brother, Isaiah, who were sleeping with their grandmother in a sofa bed behind the door, according to Charlie Howard, the victims’ uncle.

Ty-Teyanna was rushed to Grady Memorial Hospital, where she was pronounced dead. The boy was taken to Children’s Healthcare of Atlanta at Egleston, where he was initially listed in stable but critical condition.

The children’s mother said Monday her son will likely be released from the hospital this week. A fund has been started at Wells Fargo bank in Ty-Teyanna Motley’s name to help the family with funeral costs.

Anyone with information on the shooting is asked to contact homicide investigators at 404-546-4235 or Crime Stoppers at 404-577-8477.