Mother of Georgia shooting suspect 'called school 30 minutes before attack'

The mother of the Georgia shooting suspect called the school 30 minutes warning of an "extreme emergency" before he allegedly opened fire there, his aunt has claimed. 

Mother of Georgia shooting suspect 'called school 30 minutes before attack'
The mother of the Georgia shooting suspect called the school 30 minutes warning of an "extreme emergency" before he allegedly opened fire there, his aunt has claimed.