A woman who worked at one of the businesses destroyed in a fire that killed two Kansas City firefighters faces additional charges.

Forty-three-year-old Thu Hong Nguyen is charged in an indictment returned Friday with causing a catastrophe and two counts of second-degree assault in the Oct. 12 fire. She was charged previously with second-degree murder and first-degree arson.

When a wall of a burning building collapsed, 43-year-old Larry Leggio and 39-year-old John Mesh were killed and two other firefighters were hurt.

Nguyen is being held on $2 million bond. Her attorney, Bill Shull, said he was "surprised about some of the new allegations" but that he couldn't comment further because he hadn't had a chance to review the new indictment.