JONESBORO, GA. (WXIA) -- Clayton County Police released many new details Tuesday about what they believe led to a home invasion that left two children dead.

Daveon Coates, 15, and his sister, 11-year-old Tatiyana Coates, were gunned down early Saturday.

Police said no parents were home when the shooting occurred, and that a young child called 911 to report the invasion. 

In a Tuesday afternoon news conference, Clayton County Police Chief Michael Register said that it appears the shooting were gang-related.

Register said that it appeared that the mother of Daveon and Tatityana allowed a family of five from Chattanooga, Tenn., to move into the home on Libby Lane. 

A 15-year-old in that family had gotten involved in gangs in the metro Atlanta area.

The shootings at the home early Saturday were related to the 15-year-old's gang activity, and that the two children who were killed were not the intended targets.

Register said that the 15-year-old allegedly involved in gang activity had fled to Chattanooga. Register said that teen had been located and taken into custody on Tuesday afternoon. 

Police believe the 15-year-old has valuable information about who the shooters might be.

Anyone with information about the shooting is asked to call 911.