A transformer exploded in San Francisco on Friday prompting a shelter-in-place for some residents.

It happened near Van Ness and Green around 6:55 p.m.

Authorities say firefighters are going door to door to notify residents if they need to shelter in place.

Pacific Gas and Electric crews are headed to the scene.

As of 9 p.m., 108 PG&E customers were without power because of the explosion.

This story is still developing.

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