Fire Below I-280 in San Francisco Closes Freeway Ramps

SAN FRANCISCO (CBS SF) -- The Mariposa off- and on-ramps for Interstate 280 in San Francisco reopened after firefighters battled a blaze on Mariposa Street Sunday morning, the California Highway Patrol said.

The fire was reported around 6 a.m. and originated in the sub-basement of a commercial structure at the intersection of Mariposa and 18th streets, Fire Lt. Jonathan Baxter said.

Firefighters controlled the blaze by 6:45 a.m. The ramps remained closed for less than two hours to accommodate cleanup and firefighting equipment in the roadway, according to the California Highway Patrol.

No injuries have been reported in the blaze and Baxter said the fire didn't damage the freeway overpass.