Student gunman in Ohio warned of attack, By JOE MILICIA, Associated Press Writer Thu Oct 11, 7:42 AM ET CLEVELAND - A 14-year-old student who opened fire at his high school, wounding four people before killing himself, had a history of mental problems and was known for cussing at teachers and bickering with students. Asa H. Coon, who had been suspended for fighting, warned classmates of an attack — but none took him seriously. "When he got suspended, he was like `I got something for you all,'" said student Frances Henderson, who said she often got into arguments with Coon....