(CNN) The 21-year-old man who shot and killed two students at Aztec High School in New Mexico on Thursday had previously been investigated by the FBI for online comments about planning a mass shooting. Atchison was a former student at the high school, but he didn't graduate, according to the FBI. The high school remained closed Friday, and investigators were treating it as a crime scene and were still trying to assess all the bullet holes. How the shooting unfoldedKassetas said Atchison entered Aztec High School at 8:04 a.m. on Thursday disguised as a student. 'Parent's biggest nightmare'Two students were killed at Aztec High School in New Mexico on Thursday.

Source: CNN December 08, 2017 22:18 UTC