Smoke from a trailer fire near Mount Umunhum just south of San Jose was widely seen across the area before fire crews put it out Monday morning.
The CHP says they sent one of their planes to search after getting a report that three hikers had become lost while hiking on Mt. Umunhum.
The Mount Umunhum radar tower will remain standing for at least another five years, following a vote by the Midpeninsula Regional Open Space District board on Wednesday.
After being off limits for three decades, Mount Umunhum could be open to the public over the next few years for access to panoramic views of Monterey Bay and San Francisco.