From the list:
Three students were injured when a teacher, who is also a reserve police officer, accidentally fired his gun in a classroom as he was teaching a gun safety lesson.
:0/
FROM the article: When Alexander’s gun fired into a ceiling — injuring some Seaside High students with falling ceiling debris — he did not commit a crime, prosecutors concluded. He also didn’t violate any laws when he allowed students to handle his police service weapon and take selfies with it.