Indio, Calif -

Riverside County Sheriff's Department could not find the source of an early morning loud boom in the parking structure at Fantasy Springs Casino.

According to Riverside County Sheriff's Department spokesman Deputy Armando Munoz, around 7:15 this morning, a security guard at Fantasy Springs Casino was near the parking structure when he heard a loud explosion in the area. 

The Sheriff's Department sent in Hazmat Crews and a hazardous device team, both were unable to locate the source.

The parking structure at the rear of the casino was shut down for several hours for the investigation.  Crews were unable to locate any damage or what may have caused the noise the security guard heard.