Salinas firefighters doused flames at a storage unit building at Bridge and Lake streets early Friday. The fire was reported around 8:24 a.m. No one was injured in the fire and firefighters had it under control in about half an hour. The building's automatic sprinkler system was activated before firefighters arrived and helped keep fire under control, Acting Battalion Chief Keith Emery said. It's unclear whether the fire originated outside the building or inside, Emery said. The cause remains under investigation. Jose Luis Hernandez is a nearby business owner and he alleged that the fire was started by people camping along the railroad tracks and trying to stay warm. This was the second fire that he said his employees reported in the last two days. Emery said firefighters respond to about two fires near railroad tracks daily.