Colt Gray's chilling three words to investigators revealed after Georgia high school massacre

Colt Gray has admitted 'I did it' to investigators despite being read his Miranda rights after he was arrested for shooting dead four people at his Georgia high school.

The 14-year-old was arrested on Wednesday at Apalachee High School in Winder, minutes after authorities say he opened fire on students and teachers.

Barrow County Sheriff Jud Smith said the boy was 'still talking' after he was read his rights by authorities, according to CNN.  

Gray's father Colin, 54, has been taken into custody by local authorities and charged with  two counts of murder, four counts of involuntary manslaughter, and eight counts of cruelty to children.

Officials confirmed in a press conference that the charges stem from Colin ‘knowingly allowing’ his son to have access to the firearm used in the shooting. 

Gray was given the gun he used to shoot dead four people at his Georgia high school as a Christmas present from his father months after they were questioned by the FBI over alleged threats.

This is a developing story.