City officials are trying to ascertain how a woman was able to sneak into the North American International Auto Show after closing time to pose naked on top a new concept car.

The early Monday morning photography session occurred around 2:30 a.m. when only workers and security guards were supposed to be inside the Cobo Center where the event was being held.

Security guards noticed a photo frenzy of a woman and nearly 12 photographers using camera phones snapping digital pictures of the woman striking a pose.

Cobo Director Glenn Blanton says disciplinary action would be taken if employees were involved in the security breach.