The mother of the Georgia teenager accused of killing four people at his high school says she warned school administrators before the shooting.

Annie Brown told The Washington Post that her sister, Colt Gray’s mother, texted her saying she spoke with a school counselor and warned staff of an “extreme emergency” before the killings. Brown said Marcee Gray urged them to “immediately” find her son to check on him.

The mother of a teenager who shot dead four people phoned his school in an attempt to stop the tragedy after receiving what she interpreted as a warning message from him.