And in the public school related shooting in Edinboro,
Pennsylvania, which left one teacher dead, a shot gun pointed at
offender while he was reloading his gun prevented additional harm
(Reuters Newswire, April 26, 1998). The police did not arrive for
another ten minutes. ...
from:
Multiple Victim Public Shootings, Bombings, and
Right-to-Carry Concealed Handgun Laws:
Contrasting Private and Public Law Enforcement
John R. Lott, Jr. and William M. Landes
CHICAGO
JOHN M. OLIN LAW & ECONOMICS WORKING PAPER NO. 73
(2D SERIES)
THE LAW SCHOOL
THE UNIVERSITY OF CHICAGO
I would post the document but its too large ... its a good read