Washington  -  A 14-year-old boy was charged with shooting four people dead at a US high school, while his father was charged with manslaughter, authorities said Thursday, after the country’s latest outburst of gun violence.  The teen faces four felony murder counts after allegedly killing two fellow pupils, also aged 14, as well as two teachers at Apalachee High School in the southern state of Georgia on Wednesday. Nine people -- most of them children -- were wounded in the attack. Authorities have said they are recovering.  The suspect’s father, 54-year-old Colin Gray, was in custody and faces four counts of involuntary manslaughter, two counts of second-degree murder, and eight counts of cruelty to children, making him the latest American parent to face criminal charges after a child was involved in a mass shooting.