Las Vegas police are investigating an armed robbery of a retail store inside the Bellagio Hotel and Casino that caused panic early Saturday. In a statement released hours after the incident, police said three people were involved in the robbery, and one of the suspects fired gunshots upon entering the store. No one was injured and one suspect is in custody. Initial reports of the incident circulating on Twitter said an active shooter was in the casino, though police later refuted that account. An eyewitness said one of the robbers wore a pig mask during the incident, and photos posted on Twitter showed a man dressed in all black wearing a pig mask and wielding a gun. Parts of the casino are closed while investigators work at the scene.