LIVERMORE -- A 32-acre wild land fire threatened structures along Jerrold Road in unincorporated Livermore Thursday afternoon, a fire official said.

The fire, reported shortly before 5 p.m., brought crews from the Alameda County Fire Department, Cal Fire, the Lawrence Livermore Laboratory, and the Livermore-Pleasanton Fire Department, according to Alameda County Fire Assistant Chief Alan Evans.

Evans said the cause of the fire had not yet been determined. He did not know of any injuries or structures damaged.

Locals attempted to pitch in to help control the blaze.

Resident Richie Pimental used a hose to spray the scorched fence at his aunt's property, and a worker at the Miller Ranch armed himself with a spray bottle to put out fires that kept re-igniting on a fence post and land surrounding a vineyard.

Check back for updates.

Staff writer Katie Nelson contributed to this report.

Contact Cindi Christie at cchristie@bayareanewsgroup.com or follow her at Twitter.com/cindichristie