Prince George’s County police have confirmed that a set of fireworks startled casino patrons and resulted in a mass exit and property theft at MGM National Harbor.

The fireworks, according to a police spokesperson, were released inside the building, causing some patrons to rush outside of the building.

While police said an investigation is ongoing into the Saturday night event, they acknowledged that property was stolen following the explosion. MGM National Harbor has not confirmed the details of any theft on the property but did say that they are working closely with police to investigate the matter.