Washington: "It wasn't me I was at work It wasn't me", wrote Ryan Lanza on his Facebook page soon after he was mistakenly named as the man who shot dead 28 people, including 20 children, at a US school.

READ MORE: 27 killed in US school shootout

The shooter has been identified as 20-year-old Adam Lanza, the younger brother of Ryan Lanza. The elementary school shooting left 20 children and 8 adults dead in the US state of Connecticut, the second deadliest in US history only next to the Virginia Tech Massacre in April 2007, which claimed 33 lives.

Ryan Lanza was working at his desk at the Ernst and Young when he saw a TV report that he had fatally shot people at the elementary school in Connecticut. It was at that moment Ryan realized what his brother, Adam, might have done.

Lanza told his boss that, "I need to go."He then walked out from Times Square office of the tax real-estate group, according to a co-worker.

Ryan stoutly defended himself in a series of Facebook posts after he was mistakenly named as the killer. He wrote on his Facebook page, "I'm on the bus home now it wasn't me." Less than two minutes he wrote in capital letters, "IT WASN'T ME I WAS AT WORK IT WASN'T ME."Ryan has been detained by the police.

Over 100 people have been killed and dozens of others injured in several school shootings in the US over the last 20 years with the Virginia Tech massacre in 2007 being the deadliest claiming 32 lives, including two Indians.

In April 16, 2007 shooting on the campus of Virginia Polytechnic Institute and State University in Blacksburg, Virginia, Seung-Hui Cho shot and killed 32 people and wounded 17 others in two separate attacks, approximately two hours apart, before committing suicide.

According to a list of some violent incidents at US schools compiled by CNN on February 27, 2012 a student opened fire at Chardon High School, Chardon, Ohio killing three and wounding four others.

On October 2, 2006 Charles Roberts IV, 32, went to the small Amish West Nickel Mines School, Nickel Mines, Pennsylvania and takes at least 11 girls hostage. Five girls were killed and six others wounded. Roberts then killed himself.

On November 8, 2005, a 15-year-old student opened fire on a principal and two assistant principals at Campbell County Comprehensive High School, Jacksboro, Tennessee, killing one of them and critically wounding another.

On March 21, 2005 Jeff Weise, 16, killed his grandfather and another adult, four fellow students, a teacher and a security officer at Red Lake High School, Red Lake, Minnesota. He then killed himself.

On March 5, 2001, Charles "Andy" Williams, 15, killed two classmates and injured 13 at Santana High School, Santee, California. Williams was sentenced in 2002 to at least 50 years in prison.

On April 20, 1999, Eric Harris, 18, and Dylan Klebold, 17, killed 12 fellow students and one teacher at Columbine High School, Littleton, Colorado, before committing suicide in the school library.

On May 21, 1998, after killing his parents the previous day, 15-year old Kip Kinkel returned to Thurston High School, Springfield, Oregon, armed with a rifle. He killed two students in the school cafeteria, a 16- and a 17-year old. He was sentenced to 112 years in prison.


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