Authorities are investigating a suspicious fire at an abandoned building on the 1300 block of Isabel Avenue.
At 7:16 a.m. Saturday, firefighters responded to a structure fire after a passerby reported seeing smoke coming from the building, Livermore-Pleasanton Fire Department Battalion Chief Joe Testa said.
When firefighters arrived on scene they discovered a small blaze in one of the back rooms and quickly extinguished the fire.
It appears clothes and debris in the room caught fire, Testa said.
Firefighters are still investigating a cause of the blaze.
The vacant building used to be a flower farm, which closed years ago, Testa said.
Saturday's incident was the second fire at an abandoned building in town in a one-month span.
, near Linden Street.