Friday’s horrific shooting in Newtown, Conn., was the second deadliest in the country’s history, behind the 2007 massacre at Virginia Tech. Here is a timeline of past mass shootings.
December 14, 2012: A gunman opened fire at Sandy Hook Elementary School in Newtown, Conn., killing 26 people including 17 or 18 children.
August 5, 2012: A gunman opens fire at a Sikh temple in Wisconsin, killing six people and wounding three.
July 20, 2012: Suspect James Holmes is accused of killing 12 people and injuring 70 others during a shooting at a midnight screening of "The Dark Knight Rises" in Aurora, Colo.
April 2, 2012: Seven people were killed and three were wounded at an Oakland religious school.
Feb. 27, 2012: A 17-year-old boy shoots five of his fellow students at a school in Chardon, Ohio. Three of them die.
January 8, 2011: Rep. Gabriel Giffords and 17 others were shot by gunman Jared Lee Loughner at an Arizona supermarket. Six people were killed.
Feb. 12, 2010: A female teacher shoots and kills three people after being denied a permanent job at a university in Birmingham, Ala,
November 5, 2009: A gunman shot and killed 13 people and wounded 29 others at the military base, Ford Hood, just outside Killeen, Texas.
April 3, 2009: A gunman invaded an immigration services center in Binghamton, N.Y.,, killing 13 people and himself.
Feb.14, 2008: A young man returns to his former campus in Dekalb, Mich., and shoots dead five people before killing himself.
April 16, 2007: Thirty-two people were killed and 17 people were wounded at Virginia Tech by gunman Seung-Hui Cho, who also shot himself. The massacre is the deadliest shooting incident by a single gunman.
Oct. 2, 2006: In Nickel Mines, Pa., a man shoots 11 girls at a school run by the Amish religious community, killing five.
March 21, 2005: On an Indian reservation in Red Lake, Minn., a young man killed two people at his grandfather's home then went to his high school and shot dead seven others.
Oct. 28, 2002: In Tuscon, Ariz., a student angered over his failure to pass exams kills three people, two of them professors, before committing suicide.
Jan. 16, 2002: An expelled law student in Grundy, Va., shoots dead the dean of the school, a professor and a student, and injures three other people.
March 5 2001: Two people were killed and 13 others wounded by Charles Andrew Williams, 15, who fired from a bathroom at Santana High School in Santee, Calif.