What we know about Georgia high school shooting suspect charged with killing 4

Four people were killed and nine others were wounded after a 14-year-old student opened fire Wednesday at Apalachee High School in northern Georgia, authorities said. More information was emerging about the suspect as officials try to find out how the teen obtained the gun and determine a motive for the latest school shooting in the U.S.

More than a year ago, tips about online posts threatening a school shooting led Georgia police to interview a 13-year-old boy, but investigators didn't have enough evidence for an arrest. On Wednesday, that boy opened fire at his high school outside Atlanta and killed four people and wounded nine, officials said.