Details are still coming in, but we know that a shooter opened fire this morning at Sandy Hook Elementary School in Newtown, Conn. Initial reports indicate that as many as 26 people were killed, with as many as 18 children among the deaths. The alleged lone gunman was also found dead at the school.
This video should show live coverage. A news conference has been scheduled with local law enforcement, and it's supposed to begin shortly.
Update: The gunman has a connection to the school -- his mother was a kindergarten teacher at this elementary school, and she was among today's victims.
Second Update: The Associated Press is reporting the suspected shooter is 20-year-old Adam Lanza. His older brother, 24-year-old Ryan Lanza of Hoboken, N.J., is being questioned by police. The AP report added, "An earlier report from a law enforcement official mistakenly transposed the brothers' first names."
If the fatality numbers are accurate, it would be among the deadliest school shootings in American history. Below is a timeline dating back to the Columbine massacre, building a list published earlier this year by Agence France Presse.
-- April 20, 1999: In Littleton, Colorado, Eric Harris, 18, and Dylan Klebold, 17 shoot dead 13 people and injure 24 at Columbine High School, before committing suicide. The two students had plotted the killings for a year.
-- January 16, 2002: An expelled law student in Grundy, Virginia shoots dead the dean of the school, a professor and a student, and injures three other people.
-- October 28, 2002: In Tuscon, Arizona, a student angered over his failure to pass exams kills three people, two of them professors, before committing suicide.
-- March 21, 2005. On an Indian reservation in Red Lake, Minnesota, a male teenager kills two people at his grandfather's home then goes to his high school and shoots dead seven others.
-- October 2, 2006: In Nickel Mines, Pennsylvania, a man shoots 11 girls at a school run by the Amish religious community, killing five.
-- April 16, 2007: A South Korean student shoots dead 32 people on his campus of Virginia Tech, at Blacksburg. The incident is the deadliest campus shooting in US history.
-- February 14, 2008: A young man returns to his former campus in Dekalb, Michigan and shoots dead five people before killing himself.
-- February 12, 2010: A woman teacher angry at being denied a permanent job at a university in Birmingham, Alabama, shoots dead three people there.
-- February 27, 2012: A 17-year-old boy shoots five of his fellow students at a school in Chardon, Ohio. Three of them die.
On April 3, 2012, there was also a shooting in which a gunman killed seven people at a private religious college in the Oakland area. Three others were injured.