An outage has left more than 1,600 PG&E customers without power in San Francisco’s Richmond district this morning, a utility spokesman said.

The outage, which was reported around 8:45 a.m., is affecting 1,627 customers in an area north of Anza Street and west of 26th Avenue, PG&E spokesman Joe Molica said.

Crews were on site as of about 9 a.m., working to restore power, Molica said.

He said PG&E has not yet determined what caused the outage.

“It’s too early to tell,” he said.