SAVANNAH, Georgia (AP) — A filmmaker says Georgia state authorities broke a promise to grant her immunity from prosecution when they charged her with crimes stemming from a fatal train collision during shooting of a movie about singer Gregg Allman.

Hillary Schwartz, an assistant director on the movie "Midnight Rider," is one of four people charged with involuntary manslaughter and trespassing in the Feb. 20 crash that killed camera assistant Sarah Jones and injured six others in Georgia.

In a court filing Monday, Schwartz's attorneys asked a judge to dismiss the charges. They say Schwartz agreed to an interview with prosecutors who assured her that she was a witness, not a suspect. Schwartz was indicted less than two months later.

Prosecutor Jackie Johnson said Tuesday that she's not aware of an immunity agreement.