THORNTON, Colo. (AP) -- Colorado's top law-enforcement officer says the response to the shootings at suburban Denver school shows that training for teachers, students and police has paid off.
But Attorney General John Suthers said Thursday that officials can't relax their guard.
Suthers spoke to a conference on school safety training two days after a gunman wounded two students at Deer Creek Middle School. A teacher tackled the suspect, who was arrested.
Suthers says more than 250 students have been killed in school shootings nationwide since the 1999 massacre at Columbine High School.
Suthers says there's no way to stop a determined shooter, citing killings at Colorado's Platte Canyon High School in 2006, at Virginia Tech in 2007 and the University of Alabama this month.
(Copyright 2010 by The Associated Press. All Rights Reserved.)
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