Terrified students turned to social media to console one another and find out more information. NBC's Kevin Tibbles reports.
In rare situations, students who are isolated from their peers, and lose interest in activities they used to like doing, can sometimes become violent. NBC's Chris Jansing reports.
Steve Sipek gives a milk to his pet lion in Loxahatchee, Fla., on July 14, 2004.
The death of 11-year-old Joanna Ramos, who died hours after fighting with a classmate, was ruled a homicide. KNBC-TV's Kim Baldonado reports.
MSNBC panelists debate whether or not the pipeline is a "no-brainer."
U.S. Coast Guard via AP
Fire boat response crews spray water on the burning remnants of BP's Deepwater Horizon offshore oil rig on April 21, 2010.
Democratic strategist David Goodfriend argues the Justice Department should take a tough stand against BP even if businesses and individuals reach a settlement.
A student at Chardon High School in Ohio, who was grazed by a bullet when a fellow student opened fire in the school cafeteria, tells WKYC-TV he used to be friends with the shooter until he got into a "gothic phase."
Ohio officials hold a news conference on the shooting at Chardon High School that left one person dead and four injured.
Video from WKYC-TV in Cleveland, Ohio, shows the suspect in the Chardon High School shooting being taken into custody.
Law Enforcement and school officials speak in Chardon, Ohio, where one student was killed and four others were injured in a shooting incident at a high school.
John Makely / msnbc.com
An empty lot in Detroit's Palmer Woods neighborhood where Mitt Romney's boyhood home once stood.
Ricardo Thomas/ The Detroit News via AP
This May 15, 2010 photo shows the onetime home of Michigan's Romney family in the Palmer Park section of Detroit. A demolition crew in Detroit torn down on Tuesday June 8, 2010 the 5,500-square-foot house that was lived in by former Massachusetts Gov. Mitt Romney when he was a child. The dilapidated, two-story home torn down Tuesday in the Palmer Woods area was one of 3,000 set for demolition this year under Detroit Mayor Dave Bing's plans to improve neighborhoods by getting rid of dangerous structures and eyesores.
Paul Sancya / AP
The former home of one of Michigan's most prominent political families lies in debris after being demolished in Detroit Tuesday, June 8, 2010. Crews demolished, as part of Detroit's plan to tear down neighborhood eyesores and dangerous houses, the 5,500-square-foot, two-story structure where George Romney raised his family for a time before being elected governor. Former Massachusetts governor and one-time Republican presidential candidate Mitt Romney was raised in the home in the once prestigious Palmer Woods area.
Mike O'Brien / msnbc.com
Boarded up storefronts on Woodward Ave. near Palmer Park in Detroit.
Joanna Ramos, 11, died hours after exchanging punches with a classmate. The two girls were reportedly fighting over a boy. KNBC-TV's Angie Crouch reports.
This photo provided by the Jackson, Tenn. police shows Lecarlos Todd, who was killed in a shooting at the Karma Lounge in downtown Jackson; 19 others were injured. (AP Photo/Jackson Police)
A member of the #88 Diet Mountain Dew/National Guard Chevrolet crew wipes water from pit equipment during a rain delay for the NASCAR Sprint Cup Series Daytona 500 at Daytona International Speedway on Feb. 26.
Gerry Broome / AP
Megan Chance and her son Alex visit with Burma. left, and Lulu in Washington, N.C., Jan. 31. Megan rode Burma as a child in New Jersey and planned to bring her to North Carolina where she was starting a new stables. But, after leaving her on a year breeding contract, Burma vanished. For years Megan searched in vain, eventually deciding her horse must be dead. Last summer, Burma was rescued from the "kill pen" at a New Jersey auction and test facility and the two were recently reunited.
Gerry Broome / AP
Megan Chance rides Burma for the first time since the two were reunited, Jan. 31.
Gerry Broome / AP
An old portrait of a young Burma is shown in the home of Megan Chance.