Connecticut School Shooting -- Shooter Allegedly Involved in Previous Fight at School

Adam Lanza -- the man who shot and killed 26 people at Sandy Hook Elementary School in Connecticut on Friday -- was reportedly involved in an altercation with four adults at the school on Thursday ... three of whom died in the attack.

A law enforcement source tells CNN the disagreement had something to do with Lanza trying to enter the school. It was unclear of altercation happened inside the school or outside.

CNN is also reporting that Lanza tried to buy a gun on Tuesday at a nearby Dick's Sporting Goods, but was unsuccessful. According to CNN's source, all three guns used in the attack belonged to his mother.

Source: http://www.hollywoodnewslinks.com/connecticut-school-shooting-shooter-allegedly-involved-in-previous-fight-at-school/