SAN LEANDRO -- More than 500 residents in unincorporated Alameda County were without power Saturday morning, PG&E officials said.

The power outage was reported at about 11:20 p.m. Friday in Ashland, just outside San Leandro.

Neither the cause of the outage nor the estimated time of power restoration has been determined, according to PG&E.

Bay City News Service contributed to this report.

Contact Natalie Neysa Alund at 510-293-2469. Follow her at Twitter.com/nataliealund.