By JUAN A. LOZANO and JAKE BLEIBERG, Associated Press HOUSTON (AP) — A 16-year-old student mistakenly shot his friend in their Houston-area high school's ROTC room before fleeing and being arrested several hours later, officials said Wednesday. The two were in a room at Bellaire High School with four other students but no adult Tuesday afternoon when the 16-year-old took a semi-automatic pistol out