The parents of 9 children and one teacher, who survived the mass shooting at Sandy Hook Elementary School, are suing the businesses behind the rifle used in the tragedy.

Koskoff, Koskoff & Bieder, the law firm that is representing the families announced Monday that is has filed a lawsuit against Camfour, a gun distributor, Riverview Gun Sales and the Freedom Group, the company that owns Bushmaster.

The lawsuit was filed a day after the second anniversary of the event, where Adam Lanza, used the Bushmaster AR-15 rifle to kill 20 first-graders and six adults. The suit claims that the weapon used should not have been entrusted to the general public, because it is a military assault weapon not suitable for civilian use.

“The AR-15 rifle, designed as a lightweight but fearsome combat weapon for troops in Vietnam, can expel 30 bullets in a matter of seconds, each of which is capable of piercing body armor and causing catastrophic injury,” the suit claims.

So far no comments have been made by the defendants named in the lawsuit.