VIDEO: SKY7 footage of massive fire sparked by gas explosion in SF's Inner Richmond

SAN FRANCISCO (KGO) -- Crews battled a 3-alarm fire sparked by a gas explosion in San Francisco's Inner Richmond neighborhood on Wednesday.

A witness told ABC7 News that the fire was at the Hong Kong Lounge II, which was under construction, but it appears the four buildings are involved.

RELATED: San Francisco crews respond to fire possibly sparked by gas explosion near USF

Everyone within a one-block radius was ordered to evacuate.

SKY7 was over the scene of the massive blaze.

Take a look at full coverage on the gas explosion and fire on Geary Boulevard in San Francisco.