(CNN) A 14-year-old has been charged with five counts of murder after confessing to shooting his family members in their Elkmont, Alabama, home, police said Tuesday.

The victims are: John Sisk, 38, the boy's father; his stepmother, Mary Sisk, 35; his 6-year-old stepbrother; his 5-year-old stepsister; and his 6-month-old stepbrother, Limestone County Sheriff's Office spokesman Stephen Young told reporters. Earlier, authorities said the child victims were siblings.

Investigators have yet to establish a motive, Young told CNN earlier.

Though the suspect faces five juvenile counts of murder, Young said the teen, "pending the adjudication process, could face adult charges of multiple counts of murder and/or capital murder."

UPDATE: Investigators have recovered the handgun from the side of the road nearby where it had been tossed. https://t.co/hayOpNXq6X — Limestone Sheriff (@LimestoneCoSO) September 3, 2019

Investigators found the handgun allegedly used in the killings on "the side of the road nearby where it had been tossed," the sheriff's office said in a tweet. Earlier, the office said the teen was assisting police in locating a 9 mm handgun that he had discarded near the scene.

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