There is little that sends chills racing up the spines of emergency responders than a report that a school bus has been in a bad accident -- a school bus loaded with youngsters, some of whom are likely injured and in desperate need of medical aid and comfort.

That was the scenario on April 17 at the Nevada Pic-A-Part wrecking yard at 5090 N. Lamb Boulevard as the North Las Vegas Fire Department conducted a full-blown mass casualty extrication drill.