A woman was killed in Chicago O’Hare International Airport after entering a Baggage carousel on August 8. The 57-year-old was a member of the public and not a Airport employee.

First Aiders were called O’Hare’s Terminal 5 at around 7:45 a.m. on Thursday after receiving reports of a woman “trapped in a machine.” Chicago Fire Department told ABC News. When they arrived at the scene, the woman was “involved in the Converter belt system used to transport luggage. Her death was confirmed at the scene of the accident.

Surveillance material Police photos showed the woman “entered an unoccupied restricted area at 2:27 a.m.,” ABC News reported, but she was not found until about 7:30 a.m. that same morning.

Here you can learn more about the events of ABC 7 Chicago:

Police confirmed that the woman had apparently stayed at the airport overnight, but why she sneaked into the employee-only area remains a mystery.

Authorities said the area where the incident occurred was off-limits to employees and was considered safe but not a high-security area. It was full of conveyor belts that transport baggage to and from planes in the international terminal, which also go through customs.

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Police have not said whether they were able to track the woman’s activities between 2:30 a.m. and 7:30 a.m.

It is still unclear where she lived or why she was in the Airportreports ABC 7. Now the area has been declared a crime scene, and the Chicago Police Department examines exactly how this terrible situation came about.