Victims of the shooting at a US cinema showing the latest Batman film have filed a lawsuit accusing theatre bosses of negligence.
Two lawsuits were filed on Friday in the US District Court on behalf of Denise Traynom, Brandon Axelrod and Joshua Nowlan, who were wounded in the Colorado shooting.
The lawsuits against the subsidiary of Cinemark Holdings Inc are believed to be the first and were filed on the same day the company revealed plans to refurbish and reconfigure the Century 16 multiplex, according to The Hollywood Reporter magazine.
Gunman James Holmes has been charged with 142 counts, including first-degree murder, after 12 people were killed and 58 others were injured during a screening of Batman movie The Dark Knight Rises in Aurora, Colorado, in July.
The lawyers for Traynom, Axelrod and Nowlan allege the owners of the Century 16 multiplex should have been equipped with an alarm system which could have stopped Holmes allegedly propping open a fire exit to get guns from his car.
They also claim the cinema should have been provided heightened security for the midnight screening and are demanding $US750,000 ($A721,880) each in damages.
The cinema has been closed since the massacre but is due to re-open early next year.