Three firefighters suffered minor injuries in a four-alarm fire in Lower Manhattan this morning.

A caller reported the blaze on the first floor of the five-story commercial and office building at 138 Fulton St. around 6:55 a.m., and firefighters arrived within minutes, officials said. No one was believed to be inside at the time.

The fire was finally brought under control around 9:40 a.m.

No civilians were injured, but three members of the FDNY who suffered smoke inhalation were taken to area hospitals, a spokesperson for the department said.

The cause of the fire is still under investigation, but authorities said they do not believe the it is suspicious.