Students Nervously Return To School After Shooting

...Northern Virginia's Fairfax County Public Schools, the largest school system in the Washington area with about 181,000 students, will provide additional police patrols and counselors.
"This is not in response to any specific threat but rather a police initiative to enhance safety and security around the schools and to help alleviate the understandably high levels of anxiety," Superintendent Jack Dale said Sunday...

http://www.npr.org/templates/story/story.php?storyId=167426390