(NEWSER) – Two brothers allegedly tried to kill their drugged parents and burn down their home near Atlanta Saturday morning, and neither their parents nor the police have any idea why, CNN reports.

Police say Cameron Ervin, 17, and Christopher Ervin, 22, slipped their parents Xanax to make them sleepy before attacking them. Their father Zachary escaped to the garage and started hitting a car horn to try to get neighbors' attention; his wife Yvonne ran upstairs to hide and call 911. Sgt. Rich Long tells CNN this probably saved their lives. The Atlanta Journal Constitution reports the 911 dispatcher could hear Yvonne listening to her sons coming up the stairs and one of them asking if she was on the phone before dragging her away; she was beaten, and her husband was beaten and stabbed.

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