HARTFORD (AP) — A law firm representing the families of nine of the 26 people killed and a teacher injured at Sandy Hook Elementary School on December 14, 2012, says it has filed a lawsuit against the manufacturer, distributor and seller of the rifle used in the shooting.

The negligence and wrongful death lawsuit asserts that the Bushmaster AR-15 rifle should not have been made publicly available because it is a military weapon unsuited for civilian use.

In addition to Bushmaster, the families have named Camfour, a firearm distributor, and Riverview Gun Sales, the store where the Bushmaster rifle was purchased in 2010. Messages seeking comment from the defendants were not immediately returned.

The 40-page complaint was filed in superior court in Bridgeport.