12 year old South African boy battling for his life after he was poisoned in school

A 12-year-old South African boy is battling for his life after he was poisoned in school. His sister shared the news and photos of him in the hospital on her Twitter page. She wrote;

My Little Brother He Is Only 12 Years Doing Grade 6!!  And he is fighting for his life,after he was fed poison at school. Some People Can Be Ruthless,Heartless and Cruel!!! Like Why Would you wanna kill a kid!? An innocent kid?