Souvannarath has also been ordered to provide a sample of her DNA and will be subjected to a firearms prohibition for 10 years after her release from prison.

A former Oklahoma volunteer sheriff's deputy who said he mistook his handgun for his stun gun when he fatally shot an unarmed suspect last year was convicted of second-degree manslaughter on Wednesday.

Social media pages believed to be linked to a deceased Halifax shooting plot suspect have put the spotlight on a dark corner of the web – fan pages dedicated to the Columbine school shooting.