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State Police are on scene following a shooting at the Sandy Hook Elementary School in Newtown, Conn., about 60 miles (96 kilometers) northeast of New York City, Friday, Dec. 14, 2012. An official with knowledge of Friday's shooting said 27 people were dead, including 18 children. (AP Photo/Jessica Hill)
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.