Students from Salida Del Sol Elementary School are evacuated to the school cafeteria by police officers after three schools went into lockdown on Tuesday, Feb. 5, 2013, in Yuma, Ariz. The unconfirmed report of a person with a gun initially prompted the lockdown, but no gun was found. (AP Photo/The Yuma Sun, Craig Fry)

Photo by: Craig Fry

Students from Salida Del Sol Elementary School are evacuated to the school cafeteria by police officers after three schools went into lockdown on Tuesday, Feb. 5, 2013, in Yuma, Ariz. The unconfirmed report of a person with a gun initially prompted the lockdown, but no gun was found. (AP Photo/The Yuma Sun, Craig Fry)