US school shooting suspect interviewed about online threats last year

Brandy Rickaba and her daughter Emilie pray during a candlelight vigil for students and teachers killed at Apalachee High School in Georgia, US (Mike Stewart/AP)

A teenage boy charged with killing four people at his high school in Georgia was interviewed last year by police about anonymous online threats, the FBI said.

The 14-year-old opened fire at his high school outside Atlanta, killing four people and wounding nine.