Gov. Pat Quinn has signed a law requiring Illinois schools to hold safety drills that include practicing what to do during a possible school shooting.
The governor says the law increases school safety in the wake of December's mass shooting at Sandy Hook Elementary School in Connecticut.
Schools already conduct at least six drills a year, including for severe weather.
The new law says that law enforcement officials also must include preparation for a potential shooting.
The law takes effect immediately and applies to each school building where classes are held.