Calaveras County Sheriff's Detectives are investigating a loud explosive sound that was reported in several communities yesterday.

According to the Sheriff's Office, at around 8:50 am, the Sheriff's dispatch received multiple 9-11 calls from San Andreas, Mokelumne Hill, Mountain Ranch, Railroad Flat and West Point. All of the callers said that heard a single loud explosion type noise, but there were no reports of fire or smoke being seen and no specific location given.

Several callers also stated that a plane had flown overhead just prior to the loud explosion and they suspected it was a sonic boom. Sheriff's Dispatch checked with the FAA and Calaveras County Airport who had no reported planes in distress in the area.

The Sheriff's Office will also follow-up with local military contacts in an attempt to confirm the possible sonic boom that was heard by many county residents.