A woman was struck by several cars after falling from a moving party bus on a Kansas City, Mo., interstate. KSHB's Garrett Haake reports.

A 26-year-old Missouri mother died Saturday after falling out of a "party bus" when the vehicle's emergency doors flew open while driving on a busy highway en route to what was supposed to be a fun night out with friends.

Jamie Frecks was out celebrating a friend's bachelorette party when she fell out of the bus and was struck by at least three vehicles, NBC Kansas City affiliate KSHB reports.

She was pronounced dead at the scene.

Frecks's aunt Cynthia Matteson said the family is devastated over the young mother's death and is demanding answers as to how the accident occurred.

"Why wasn't it secured?" Matteson told KSHB. "A person hires a person for safety, to get you there and back home. Why wasn't she brought back home safe?"

Eddy Goetz, one of the owners of Midnight Express party bus, which operates the vehicle, said the company has "no idea" how the doors could have come open.

In a statement to KSBH, Goetz said: "On behalf of the owners and employees of Midnight Express party bus, we want to express our sincere sympathy for the family and friends touched by Saturday night’s tragic accident that took the life of Jamie Frecks. We are trying to find out how the tragic accident could have happened. We will cooperate fully with everyone to find out the cause of this accident."

Frecks leaves behind a 5-month-old child.