UPDATE: This story has been changed to include Verizon’s explanation for the outage.

FRESNO, Calif. (KSEE/KGPE) – Verizon cell phone services are returning to normal after an outage across large areas of California – including the Fresno region, according to Verizon officials.

Cell phone calls on the Verizon network made since the outage was detected were unable to connect. First reports of the service being down were received around 12:30 p.m. on Wednesday.

A post on the Clovis Police Department’s Twitter page stated that 911 services are still operating, but dispatch is unable to call back for 911 hangups from cell phones.

On Twitter, Verizon officials say they “are aware some customers in your [Fresno] service area may be experiencing issues and our network teams are looking into this.” Verizon later revealed that the cause of the outage was a “fiber issue” which “caused some customers to experience intermittent call failures.”

According to Downdetector, Verizon service issues were also present in other parts of California, as well as other states on the West Coast.