UPDATE: Victoria Soto, Dawn Hochsprung, Mary Sherlach: Heroic Sandy Hook Staff Gunned Down

UPDATE: Nancy Lanza Not Teacher at Sandy Hook? Often Took Adam Lanza Target Shooting? 

UPDATE: Adam Lanza and Ryan Lanza: Two Brothers Mixed Up As Sandy Hook Elementary School Shooter  

UPDATE: ADAM LANZA Found Dead? Ryan Lanza Not Newtown Elementary School Shooter? 

UPDATE: Obama Weeps In Statement Address - Watch Statement Video Here 

UPDATE: Ryan Lanzla Killed Mother First, Then Himself - 22 Children Dead 

UPDATE: Sig Sauer and Glocks Used by Ryan Lanza 

UPDATE: Ryan Lanza; Newtown Elementary School Shooter Identified 

A horrific shooting massacre at an elementary school in a Connecticut school has shocked the nation. At least 27 people were killed when gunmen reportedly started firing rounds at Sandy Hook Elementary school shortly after 9:30 am on Friday. 

The principal, school psychologist, the gunman, and children are among the dead in what is being dubbed as the worst school shooting in U.S. history.

All schools in the surrounding area have been locked down. "Due to reports of a shooting as yet unconfirmed, the district is taking preventive measures by putting all schools in lockdown until we ensure the safety of all students and staff," Newton Public School District secretary of superintendent Kathy June said in a statement.

The identities of the gunmen have not been identified as of yet but some news outlets are reporting that one of the gunman is a father of a child that attended Sandy Hook Elementary school. 

Victims who have been injured in the deadly shootout are reportedly in "very serious" condition. 

Although the total death toll has not been confirmed in the grisly shooting at Sandy Hook Elementary school, the number is expected to exceed beyond the Virginia Tech massacre in 2007. 

On April 16, 2007, gunman Seung-Hui Cho, a student at the school, went on a shooting rampage that left 32 dead and 17 wounded. 

If only one gunman is involved in Friday morning's shooting, the tragedy may top the five worst gun massacres in the world by an individual. 

The following are the top five gun massacres by an individual. 

1) In July 2011, Anders Behring Breivik of Norway shot and killed 77 people, wounding 151. 

2) In April 1982, gunman Woo Bum-Kon of South Korea killed 57 and left 35 people wounded. He committed suicide at the scene.

3)In April 1996, Martin Bryant shot to death 35 victims and wounded 21 others.

4) In April 2007, Seung-Hui Cho of USA killed 32 people and wounded 25. Cho also committed suicide at the scene. 

5) In Dec 1986, Campo Elias Delgado of Colombia killed 30 and wounded 15 others.