SAN FRANCISCO — The Latest on a gas leak that led to an explosion in San Francisco (all times local):

5:55 p.m.

Officials are investigating the cause of an explosion that ripped through an apartment building in a San Francisco neighborhood Monday.

About 100 people have been allowed to return to their homes after being evacuated from a residential neighborhood following a gas leak and explosion earlier in the day.

Battalion Chief Rex Hale says a fire crew was checking on a gas leak when the explosion happened, blowing out windows and a garage door. No one was injured.

Hale says it appears gas accumulated in a garage and hit a pilot light, causing the explosion.

Pacific Gas and Electric Co. spokeswoman Andrea Minetti says the company is investigating the cause.

2 p.m.

A San Francisco fire official says about 100 people evacuated after a gas leak lead to an explosion in a San Francisco residential neighborhood. No one was injured.

Battalion Chief Rex Hale says a fire engine arrived Monday to check on a gas leak and a crew was walking toward the building when the explosion happened, blowing out windows and a garage door.

Hale says the explosion occurred in the lower floors of a three-story building in the Bernal Heights neighborhood and that no one was inside the building.

He says it appears gas filled up a garage and it hit a pilot light, causing the explosion.

Residents of 19 nearby apartments and homes were evacuated and Hale says it’s not clear when they will be allowed back in their homes.

12:18 p.m.

Fire officials say a gas leak turned into an explosion in a residential San Francisco neighborhood and that nearby buildings are being evacuated. No injuries have been reported.

San Francisco fire officials say the explosion at an apartment building happened Monday morning after an initial report of a gas leak.

Television images show window blinds and glass blown out from the second story of an apartment building into a street in the Bernal Heights neighborhood.

The San Francisco Fire Department says it is working with Pacific Gas and Electric Company on the gas leak.

PG&E did not immediately return a call seeking comment.

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