The shooter was most likely firing blanks, and the wounds were inflicted by powder burns:
http://deadlinelive.info/2010/10/15/kelly-school-shooter-this-is-a-drill-and-these-are-blanks/
No fucking way, that article is complete bullshit! I work for the school district and THIS WAS NOT A DRILL, two students were shot with flesh-wounds through their arms. It was a miracle that no one was killed as he fired 5 or so shots into the crowd. Believe me, we have been dealing with the fallout for this entire week, not only with the students, but with the staff and parents as well, and it will continue for some time. Why must everyone automatically assume a conspiracy theory is the correct one!